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  1.  
  2. Question Number 1   Points: 5.00/5.00
  3. Question Text
  4.  
  5. Which of these pairs of variables would you expect to be
  6. represented by a scatterplot with a negative correlation?
  7. A. The weight of a package and the cost to mail the package.
  8. B. The amount of gas in the tank of a car and the number of miles
  9. driven.
  10. C. The cost of a car and the number of tires it has.
  11. D. The cost a telephone call and the length of the call.
  12. Your Answer
  13. B. The amount of gas in the tank of a car and the number of miles
  14. driven.
  15. Question Number 2   Points: 5.00/5.00
  16. Question Text
  17. A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 12.8 grams of radioactive substance. 9 days later, there are 7.33 grams. After 14 days, there are 5.38 grams. After 30 days, there are 2.00 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days and use the equation to determine the amount of radioactive material remaining after 50 days.
  18. A. 0.56 g
  19. B. 0.58 g
  20. C. 3.27 g
  21. D. 3.33 g
  22. Your Answer
  23. B. 0.58 g
  24. Question Number 3   Points: 5.00/5.00
  25. Question Text
  26. Describe the following scatterplot.
  27.  
  28. A. positive correlation
  29. B. negative correlation
  30. C. no correlation
  31. D. constant correlation
  32.  
  33. Your Answer
  34. B. negative correlation
  35. Question Number 4   Points: 5.00/5.00
  36. Question Text
  37. What is the value of a in the quadratic regression equation for these points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  38. A. -4.26
  39. B. -3.7
  40. C. -2.4
  41. D. -0.96
  42. Your Answer
  43. C. -2.4
  44. Question Number 5   Points: 5.00/5.00
  45. Question Text
  46. Describe the following scatterplot.
  47.  
  48. A. positive correlation
  49. B. negative correlation
  50. C. no correlation
  51. D. constant correlation
  52.  
  53. Your Answer
  54. B. negative correlation
  55. Question Number 6   Points: 5.00/5.00
  56. Question Text
  57. Ft. Clyman General Hospital created a scatter plot to illustrate the number of babies that were born in the maternity ward over the past several years. The data for 1996 was missing. According to the scatter plot, approximately how many babies do you predict were born during 1996?
  58.  
  59.  
  60. A. 400
  61. B. 700
  62. C. 800
  63. D. 1,000
  64. Your Answer
  65. B. 700
  66. Question Number 7   Points: 5.00/5.00
  67. Question Text
  68. Find the equation of the line of best fit for the points (-3, -40), (1, 12), (5, 72), (7, 137).
  69. A. y = 3x + 17
  70. B. y = 17x + 3
  71. C. y = 17x − 3
  72. D. y = 3x + 0.98
  73. Your Answer
  74. B. y = 17x + 3
  75. Question Number 8   Points: 5.00/5.00
  76. Question Text
  77. Ft. Clyman General Hospital created a scatter plot to illustrate the number of babies that were born in the maternity ward over the past several years. The data for 1999 was missing. According to the scatter plot, approximately how many babies do you predict were born during 1999?
  78.  
  79.  
  80. A. 400
  81. B. 700
  82. C. 800
  83. D. 1,000
  84. Your Answer
  85. C. 800
  86. Question Number 9   Points: 5.00/5.00
  87. Question Text
  88. Find the correlation coefficient of the line of best fit for the points (-4, 10), (-1, 5), (2, -1), (3, -6) and (5, -7).
  89. A. -2
  90. B. -0.98
  91. C. 0.98
  92. D. 2
  93. Your Answer
  94. B. -0.98
  95. Question Number 10  Points: 5.00/5.00
  96. Question Text
  97. A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 6.2 grams of radioactive substance. 12 days later, there are 6.16 grams. After 19 days, there are 6.13 grams. After 46 days, there are 5.92 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days.
  98. A. y = 6(0.92)x
  99. B. y = 6.15(0.98)x
  100. C. y = 6.23(0.999)x
  101. D. y = 6(0.999)x
  102. Your Answer
  103. C. y = 6.23(0.999)x
  104. Question Number 11  Points: 5.00/5.00
  105. Question Text
  106. What is the value of b in the quadratic regression equation for these points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  107. A. -14.92
  108. B. 10.76
  109. C. 15.62
  110. D. 26.06
  111. Your Answer
  112. D. 26.06
  113. Question Number 12  Points: 0.00/5.00
  114. Question Text
  115. What is the quadratic regression equation for the points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  116. A. y = 2.40x^2 + 26.06x + 40.82
  117. B. y = -2.40x^2 + 26.06x + 40.83
  118. C. y = -2.40x^2 − 26.06x − 40.84
  119. D. y = -2.40x^2 + 26.06x − 40.82
  120. Your Answer
  121. C. y = -2.40x^2 - 26.06x - 40.84
  122. Question Number 13  Points: 0.00/5.00
  123. Question Text
  124. In 1990, there were 1,650 cell phone subscribers in San Antonio, Texas. In 1994, there were 5,010 and in 1999, there were 20,075. Assuming that this is exponential growth, find the exponential regression equation and use it to find the number of cell phone subscribers in 2015. Round to the nearer thousand.
  125. A. 1,705,423
  126. B. 2,834,106
  127. C. 4,204,771
  128. D. 4,786,955
  129. Your Answer
  130. D. 4,786,955
  131. Question Number 14  Points: 0.00/5.00
  132. Question Text
  133. Find the equation of the line of best fit for the points (-4, 10), (-1, 5), (2, -1), (3, -6) and (5, -7).
  134. A. y = -2x + 2
  135. B. y = 2x − 2
  136. C. y = 2x − 0.98
  137. D. y = -2x − 0.98
  138. Your Answer
  139. D. y = -2x - 0.98
  140. Question Number 15  Points: 0.00/5.00
  141. Question Text
  142.  
  143. Which of these pairs of variables would you expect to be
  144. represented by a scatterplot with a positive correlation?
  145. A. The depth of the water in a pond and the amount of rainfall.
  146. B. The number of miles driven and the number of people on the
  147. bus.
  148. C. A person's height and the person's grade on the math test.
  149. D. The number of concert tickets purchased and the number of
  150. concert tickets still available for purchase.
  151. Your Answer
  152. C. A person's height and the person's grade on the math test.
  153. Question Number 16  Points: 5.00/5.00
  154. Question Text
  155. Which scatterplot shows a positive correlation?
  156. A.
  157. B.
  158. C.
  159. D.
  160. Your Answer
  161. A.
  162. Question Number 17  Points: 5.00/5.00
  163. Question Text
  164. Find the exponential regression equation for the data points (-4, 0.75), (-2, 6), (3, 28), and (5, 162).
  165. A. y = 8.43(1.69)^x
  166. B. y = 9.17(1.70)^x
  167. C. y = 5(0.92)^x
  168. D. y = 9.46(2.93)^x
  169. Your Answer
  170. B. y = 9.17(1.70)^x
  171. Question Number 18  Points: 0.00/5.00
  172. Question Text
  173. What is the value of b in the quadratic regression equation for these points: (-3, 1.2), (1, 0.4), (5, 1.6), (11, 2.6)?
  174. A. -0.976
  175. B. -0.97
  176. C. -0.01
  177. D. 0.009
  178. Your Answer
  179. B. -0.97
  180. Question Number 19  Points: 5.00/5.00
  181. Question Text
  182. What does it mean if a is negative in the quadratic regression equation?
  183. A. The data tends to decrease as x increases.
  184. B. The equation makes a curve that opens down.
  185. C. The vertex of the parabola is below the x-axis.
  186. D. The vertex of the parabola is to the left of the y-axis.
  187. Your Answer
  188. B. The equation makes a curve that opens down.
  189. Question Number 20  Points: 5.00/5.00
  190. Question Text
  191. Find the exponential regression equation for the data points (-3, 8), (0, 5), (2, 4), and (5, 3).
  192. A. y = 5.28(0.89)^x
  193. B. y = 6.23(0.72)^x
  194. C. y = 5(0.92)^x
  195. D. y = 5.53(1.08)^x
  196. Your Answer
  197. A. y = 5.28(0.89)^x
  198. Question Number 1   Points: 5.00/5.00
  199. Question Text
  200. A researcher wants to determine the best method for teaching college students: traditional campus classes or online classes. The researcher chooses to observe the final exam grades of fifty college students enrolled in both types of courses. What would be the lurking variable in this study?
  201. A. The online courses or traditional courses
  202. B. The grades on final exams
  203. C. The participant's learning style
  204. D. If the participants are enrolled in college courses
  205. Your Answer
  206. C. The participant's learning style
  207. Question Number 2   Points: 5.00/5.00
  208. Question Text
  209. A survey asks the question, "I don't buy magazines if unless I see an article I would like to read." What question-wording issue is this an example of?
  210. A. Unbalanced Response Options
  211. B. Leading Questions
  212. C. Planting Ideas with Questions
  213. D. Complicated Questions
  214. E. Sensitive Questions
  215. Your Answer
  216. D. Complicated Questions
  217. Question Number 3   Points: 5.00/5.00
  218. Question Text
  219. Restaurant patrons are asked to fill out a comment card rating the service they received. This is an example of what type of study design?
  220. A. Survey
  221. B. Observational Study
  222. C. Experiment
  223. Your Answer
  224. A. Survey
  225. Question Number 4   Points: 5.00/5.00
  226. Question Text
  227. What is the definition of a variable?
  228. A. The action the researcher is studying
  229. B. Something that may affect the results of a study that has not been included in the design
  230. C. Something that can be changed
  231. D. The value that they are trying to make a connection to
  232. Your Answer
  233. C. Something that can be changed
  234. Question Number 5   Points: 0.00/5.00
  235. Question Text
  236. To determine if eating a good breakfast improves performance on a standardized test, a study records scores from students who did eat a good breakfast and scores from those who did not. What type of study design is this an example of?
  237. A. Survey
  238. B. Observational Study
  239. C. Experiment
  240. Your Answer
  241. A. Survey
  242. Question Number 6   Points: 5.00/5.00
  243. Question Text
  244. A survey question is worded as, "Congressmen make at least $100,000 more than the average American. Do you think congressmen make enough money?" What question-wording issue is this an example of?
  245. A. Unbalanced Response Options
  246. B. Leading Questions
  247. C. Planting Ideas with Questions
  248. D. Complicated Questions
  249. E. Sensitive Questions
  250. Your Answer
  251. B. Leading Questions
  252. Question Number 7   Points: 5.00/5.00
  253. Question Text
  254. What is the dependent variable in an experiment?
  255. A. The data recorded about the participants' behavior
  256. B. The part of the experiment that is influenced and assigned to the participants
  257. C. The participants in the study
  258. D. The group that is not assigned a treatment
  259. Your Answer
  260. A. The data recorded about the participants' behavior
  261. Question Number 8   Points: 5.00/5.00
  262. Question Text
  263. Suppose that you would like to study the occurrence of obesity in high schools in your state. One of the high schools in your state was chosen at random and the students at that school were surveyed. What type of sampling is this using?
  264. A. Opportunity Sampling
  265. B. Self-Selected Sampling
  266. C. Simple Random Sampling
  267. D. Cluster Sampling
  268. E. Stratified Sampling
  269. Your Answer
  270. D. Cluster Sampling
  271. Question Number 9   Points: 5.00/5.00
  272. Question Text
  273. A study of college tuition costs is being conducted. Ten colleges around the United States are selected at random and all of the students enrolled at those schools are selected to participate in the study. What type of sampling is this using?
  274. A. Opportunity Sampling
  275. B. Self-Selected Sampling
  276. C. Simple Random Sampling
  277. D. Cluster Sampling
  278. E. Stratified Sampling
  279. Your Answer
  280. D. Cluster Sampling
  281. Question Number 10  Points: 0.00/5.00
  282. Question Text
  283. What is the control group of an experiment?
  284. A. The data recorded about the participants' behavior
  285. B. The part of the experiment that is influenced and assigned to the participants
  286. C. The participants in the study
  287. D. The group that is not assigned a treatment
  288. Your Answer
  289. C. The participants in the study
  290. Question Number 1   Points: 5.00/5.00
  291. Question Text
  292. What do you call two events with a sum of 1?
  293. A. Complementary events
  294. B. Supplementary events
  295. C. Favorable events
  296. D. Outcome
  297. Your Answer
  298. A. Complementary events
  299. Question Number 2   Points: 0.00/5.00
  300. Question Text
  301. A card is chosen at random from a standard deck of 52 playing cards, which consists of 4 suits with 13 cards. If someone picks a card and tells you that it is a queen, what is the conditional probability that the card is a club?
  302. A. 1/52
  303. B. 1/13
  304. C. 1/4
  305. D. 1/2
  306. Your Answer
  307. A. 1/52
  308. Question Number 3   Points: 5.00/5.00
  309. Question Text
  310. Which is an example of theoretical probability?
  311. A. Raul has a batting average of .333 so he should get a hit 1 out of every 3 at bats.
  312. B. You flipped a coin 100 times and got "tails" 70 times. The probability of getting "tails" on your next flip is 70%
  313. C. Prior to conducting an experiment on rolling a die, you determine the probability of rolling a 5 at 1:6
  314. D. You roll a die 10 times and get a result of 5 three times. You determine that there is a 30% of rolling a 5 on the next roll
  315. Your Answer
  316. C. Prior to conducting an experiment on rolling a die, you determine the probability of rolling a 5 at 6
  317. Question Number 4   Points: 0.00/5.00
  318. Question Text
  319. There are 20 players on a hockey team. 5 of them are rookies. Determine the probability that none of the rookies will be randomly selected to be included in the team's group of 6 starters.
  320. A. 15 114
  321. B. 1 3,876
  322. C. 1 38,760
  323. D. 1001 7752
  324. Your Answer
  325. B. 1 3,876
  326. Question Number 5   Points: 0.00/5.00
  327. Question Text
  328. Which of the following graphs is a valid probability distribution of a random variable over a week?
  329. A.  
  330. B.  
  331. C.  
  332. D.  
  333. Your Answer
  334. A.
  335. Question Number 6   Points: 0.00/5.00
  336. Question Text
  337. Two cards are drawn without replacement from a standard deck of 52 playing cards. Find the probability that the first is an odd number card (aces are considered odd because they have a value of 1 or 11) and the second is a face card.
  338. A. (20/52)(12/51)
  339. B. (20/52)(12/52)
  340. C. (20/52)(19/51)
  341. D. (20/52)(4/51) + (4/52)(20/51)
  342. Your Answer
  343. C. (20/52)(19/51)
  344. Question Number 7   Points: 5.00/5.00
  345. Question Text
  346. Determine the probability of not getting a 5 when rolling a fair die.
  347. A. 1/6
  348. B. 1/2
  349. C. 1/3
  350. D. 5/6
  351. Your Answer
  352. D. 5/6
  353. Question Number 8   Points: 5.00/5.00
  354. Question Text
  355. A researcher wants to conduct a genetic study using 25 randomly-selected volunteers. He has a volunteer pool of 30, composed of 15 males and 15 females. What is the probability of 12 male and 13 female volunteers OR 13 male and 12 female volunteers being selected at random for the study?
  356. A. 17/522
  357. B. 455/522
  358. C. 105/522
  359. D. 175/261
  360. Your Answer
  361. D. 175/261
  362. Question Number 9   Points: 0.00/5.00
  363. Question Text
  364. A bag contains 5 blue and 3 green marbles. Marbles are drawn at random without replacement. Which of the following gives the probability of drawing a blue and then a green marble?
  365. A. (5/8)(3/7)
  366. B. (3/8)(5/8)
  367. C. (3/8)(3/8)
  368. D. (3/8)(2/7)
  369. Your Answer
  370. D. (3/8)(2/7)
  371. Question Number 10  Points: 5.00/5.00
  372. Question Text
  373. Two cards are drawn without replacement from a standard deck of 52 playing cards. Find the probability that the first is an odd number (aces are considered odd because they have a value of 1 or 11) and the second is a face card.
  374. A. (20/52)(12/51)
  375. B. (20/52)(12/52)
  376. C. (20/52)(4/51) + (4/52) (20/51)
  377. D. (20/52)(19/51)
  378. Your Answer
  379. A. (20/52)(12/51)
  380. Question Number 11  Points: 5.00/5.00
  381. Question Text
  382. A researcher wants to conduct a genetic study using 10 randomly-selected volunteers. He has a volunteer pool of 20, composed of 10 males and 10 females. What is the probability that the randomly-selected group will be all male OR all female?
  383. A. 1/184,756
  384. B. 1/92,378
  385. C. 5/138,567
  386. D. 1/138,567
  387. Your Answer
  388. B. 1/92,378
  389. Question Number 12  Points: 0.00/5.00
  390. Question Text
  391. Two cards are drawn with replacement from a standard deck of 52 playing cards. Find the probability that the first card is a king and the second is a diamond.
  392. A. (4/52)(4/52)
  393. B. (4/52)(13/52)
  394. C. (13/52)(13/52)
  395. D. (4/52)(13/52) + (13/52)(4/52)
  396. Your Answer
  397. A. (4/52)(4/52)
  398. Question Number 13  Points: 5.00/5.00
  399. Question Text
  400. What is the theoretical probability of rolling a number with a value of 4 or greater on a die?
  401. A. 3/4
  402. B. 1/3
  403. C. 1/6
  404. D. 1/2
  405. Your Answer
  406. D. 1/2
  407. Question Number 14  Points: 5.00/5.00
  408. Question Text
  409. What percentage of males prefer to drive on multi-lane highways with traffic lights?
  410.  
  411. A. 14%
  412. B. 25.5%
  413. C. 66.7%
  414. D. 100%
  415. Your Answer
  416. B. 25.5%
  417. Question Number 15  Points: 5.00/5.00
  418. Question Text
  419. Let the random variable A represent the outcome of a dice roll. Which of the following bar graphs correctly represent the probability distribution of A?
  420. A.  
  421. B.  
  422. C.  
  423. D.  
  424. Your Answer
  425. A.
  426. Question Number 16  Points: 5.00/5.00
  427. Question Text
  428. A card is chosen at random from a standard deck of 52 playing cards, which consist of 4 suits with 13 cards. If someone picks a card and tells you that it is a diamond, what is the conditional probability that the card is an ace?
  429. A. 1/52
  430. B. 1/13
  431. C. 1/4
  432. D. 1/2
  433. Your Answer
  434. B. 1/13
  435. Question Number 17  Points: 5.00/5.00
  436. Question Text
  437. Which of the following is represented by the intersection in the Venn diagram below?
  438. A. A number less than 4.
  439. B. A number less than 4.
  440. C. A number less than 4 and greater than 7.
  441. D. A number between 4 and 7.
  442. Your Answer
  443. D. A number between 4 and 7.
  444. Question Number 18  Points: 5.00/5.00
  445. Question Text
  446. Suppose a randomly-picked number is 11. Where is this number located in the Venn diagram below?
  447. A. Inside the circle on the left, excluding the intersection
  448. B. Inside the intersection
  449. C. Inside the oval on the right, excluding the intersection
  450. D. The number is not in the sample space.
  451. Your Answer
  452. C. Inside the oval on the right, excluding the intersection
  453. Question Number 19  Points: 5.00/5.00
  454. Question Text
  455. Two cards are drawn without replacement from a standard deck of 52 playing cards. Find the probability that both are odd numbers (aces are considered odd because they have a value of 1 or 11).
  456. A. (20/52)(12/51)
  457. B. (20/52)(20/52)
  458. C. (20/52)(19/51)
  459. D. (20/52)(4/51) + (4/52) (20/51)
  460. Your Answer
  461. C. (20/52)(19/51)
  462. Question Number 20  Points: 5.00/5.00
  463. Question Text
  464. Lucy has a bag of M&Ms. There are 15 blue, 7 brown, 10 green, 13 orange, 5 red, and 6 yellow candies in her bag. What is the probability that she will get a green M&M by drawing a random candy from the bag?
  465. A. 15 56
  466. B. 7 56
  467. C. 5 28
  468. D. 13 56
  469. Your Answer
  470. C. 5 28
  471. Question Number 1   Points: 5.00/5.00
  472. Question Text
  473. Hockey team A is 1 point behind hockey team B with only 30 seconds left in the game. The coach of team A decides to pull the goalie to put him in a forward position. What happens to the expected value of team A scoring a goal, and the expected value of team B scoring a goal?
  474.  
  475. A.
  476. Only the expected value of team A scoring a goal will increase.
  477.  
  478.  
  479. B.
  480. Only the expected value of team B scoring a goal will increase.
  481.  
  482.  
  483. C.
  484. Both expected values will increase.
  485.  
  486.  
  487. D.
  488. Neither expected value will increase.
  489.  
  490.  
  491. Your Answer
  492. C.
  493. Both expected values will increase.
  494.  
  495. Question Number 2   Points: 5.00/5.00
  496. Question Text
  497. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula
  498. Click here for a long description of the image above.
  499.  
  500.  
  501. to determine the probability that they will win 4 of their next 5 games. What value will be substituted for "n" in the formula?
  502. A. 4
  503. B. 5
  504. C. 40
  505. D. 75
  506. Your Answer
  507. B. 5
  508. Question Number 3   Points: 5.00/5.00
  509. Question Text
  510. The formula associated with a binomial model is .
  511. Click here for a long description of the image above.
  512.  
  513. What does the "q" in the formula represent?
  514. A. favorable outcomes
  515. B. number of trials
  516. C. probability of success
  517. D. probability of failure
  518. Your Answer
  519. D. probability of failure
  520. Question Number 4   Points: 5.00/5.00
  521. Question Text
  522. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula
  523. Click here for a long description of the image above.
  524.  
  525.  
  526. to determine the probability that they will win 4 of their next 5 games. What value will be substituted for "n" in the formula?
  527. A. 4
  528. B. 5
  529. C. 40
  530. D. 75
  531. Your Answer
  532. B. 5
  533. Question Number 5   Points: 5.00/5.00
  534. Question Text
  535. The following two sets of measurements are for the weight of the same object in grams:
  536.  
  537. {2.0, 1.9, 2.1, 1.8, 2.0} {1.8, 1.8, 2.0, 2.2, 2.2} Which of these two sets of measurements is more reliable?
  538. A.
  539. The first set
  540.  
  541.  
  542. B.
  543. The second set
  544.  
  545.  
  546. C.
  547. Both sets are equally reliable.
  548.  
  549.  
  550. D.
  551. There is insufficient information to determine which set is more reliable.
  552.  
  553.  
  554. Your Answer
  555. A.
  556. The first set
  557.  
  558. Question Number 6   Points: 5.00/5.00
  559. Question Text
  560. About 5% of a certain type of wall nails made by a hardware supplier exceeds the requirement of being able to support 500 pounds of weight. The supplier decides to remove these nails and sell them as premium wall nails. What will happen to the expected weight that the regular nails can support?
  561. A.
  562. It will be less than 500 pounds.
  563.  
  564.  
  565. B.
  566. It will remain unchanged at 500 pounds.
  567.  
  568.  
  569. C.
  570. It will be greater than 500 pounds.
  571.  
  572.  
  573. D.
  574. It will decrease by a factor of 5.
  575.  
  576.  
  577. Your Answer
  578. A.
  579. It will be less than 500 pounds.
  580.  
  581. Question Number 7   Points: 5.00/5.00
  582. Question Text
  583. A man lost a tooth due to dental problem. The dentist offers him two solutions: Live with the lost tooth for the rest of his life, or replace it with a titanium tooth replacement, which is very expensive. Which of the following should NOT be a factor in his decision making process?
  584. A.
  585. How the loss of a tooth may affect his dental health in the long run
  586.  
  587.  
  588. B.
  589. The cost of an implant
  590.  
  591.  
  592. C.
  593. His marital status
  594.  
  595.  
  596. D.
  597. How many years the titanium implant may last
  598.  
  599.  
  600. Your Answer
  601. C.
  602. His marital status
  603.  
  604. Question Number 8   Points: 0.00/5.00
  605. Question Text
  606. A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of customer purchase for the models are as follows:
  607. x   13.5    15.9    19.1
  608. P(x)    0.2 0.5 0.3 Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 5% smaller. What is the mean actual size of the freezers purchased by all customers?
  609. A. 15.6
  610. B. 16.0
  611. C. 16.4
  612. D. 37.3
  613. Your Answer
  614. B. 16.0
  615. Question Number 9   Points: 0.00/5.00
  616. Question Text
  617. A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively.  Suppose the probabilities of customer purchase for the models are as follows:
  618.  
  619. x   13.5    15.9    19.1
  620. P(x)    0.2 0.5 0.3 Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 5% smaller. What is the standard deviation in the actual size of the freezers purchased by all customers?
  621. A. 1.9
  622. B. 2.1
  623. C. 3.8
  624. D. 4.2
  625. Your Answer
  626. B. 2.1
  627. Question Number 10  Points: 5.00/5.00
  628. Question Text
  629. A paint supply store has a certain type of paint in stock. It sells the paint to a customer in lots represented by X. Suppose X has the following distribution:
  630. x   1   2   3   4
  631. P(x)    0.2 0.4 0.3 0.1
  632. Compute the expected number of lots sold to a random customer.
  633. A. 10
  634. B. 2.5
  635. C. 2.3
  636. D. 0.5
  637. Your Answer
  638. C. 2.3
  639. Question Number 11  Points: 5.00/5.00
  640. Question Text
  641. The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability that a score is more than 890.
  642. A. 1.18%
  643. B. 2.28%
  644. C. 13.6%
  645. D. 50%
  646. Your Answer
  647. B. 2.28%
  648. Question Number 12  Points: 5.00/5.00
  649. Question Text
  650. Let X represent the outcome of a single roll of a fair die. Suppose you will win $2 if the outcome is either 2 or 5, and lose $1 otherwise. What are your expected winnings in 20 tosses?
  651. A.
  652. You will not win or lose any money.
  653.  
  654.  
  655. B.
  656. You will lose $20.
  657.  
  658.  
  659. C.
  660. You will win $10.
  661.  
  662.  
  663. D.
  664. You will win $20.
  665.  
  666.  
  667. Your Answer
  668. A.
  669. You will not win or lose any money.
  670.  
  671. Question Number 13  Points: 0.00/5.00
  672. Question Text
  673. Let X represent the outcome of a single roll of a fair die. Suppose you will win $2 if the outcome is 5, and lose $1 otherwise. What can you expect to win tossing the coin 20 times?
  674. A.
  675. You will not win or lose any money.
  676.  
  677.  
  678. B.
  679. You will lose $20.
  680.  
  681.  
  682. C.
  683. You will win $10.
  684.  
  685.  
  686. D.
  687. You will lose $10.
  688.  
  689.  
  690. Your Answer
  691. C.
  692. You will win $10.
  693.  
  694. Question Number 14  Points: 5.00/5.00
  695. Question Text
  696. The life expectancy of a certain tire is a normal distribution with the mean = 40,000 miles, standard deviation is 1,000 miles. Find the probability that a tire will last more than 39,000 miles.
  697. A. 50%
  698. B. 68.2%
  699. C. 81.8%
  700. D. 84.1%
  701. Your Answer
  702. D. 84.1%
  703. Question Number 15  Points: 5.00/5.00
  704. Question Text
  705. The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability that a score is less than 610.
  706. A. 1.18%
  707. B. 2.28%
  708. C. 13.6%
  709. D. 50%
  710. Your Answer
  711. B. 2.28%
  712. Question Number 16  Points: 5.00/5.00
  713. Question Text
  714. The formula associated with a binomial model is .
  715. Click here for a long description of the image above.
  716.  
  717. What does the "n" in the formula represent?
  718. A. favorable outcomes
  719. B. number of trials
  720. C. probability of success
  721. D. probability of failure
  722. Your Answer
  723. B. number of trials
  724. Question Number 17  Points: 5.00/5.00
  725. Question Text
  726. The life expectancy of a certain tire is a normal distribution with the mean = 40,000 miles, standard deviation is 1,000 miles. Find the probability that a tire will last between 38,000 and 42,000 miles.
  727. A. 50%
  728. B. 68.2%
  729. C. 95.5%
  730. D. 84.1%
  731. Your Answer
  732. C. 95.5%
  733. Question Number 18  Points: 0.00/5.00
  734. Question Text
  735. The life expectancy of a certain tire is a normal distribution with the mean = 40,000 miles, standard deviation is 1,000 miles. Find the probability that a tire will last between 39,000 and 41,000 miles.
  736. A. 50%
  737. B. 68.2%
  738. C. 81.8%
  739. D. 84.1%
  740. Your Answer
  741. D. 84.1%
  742. Question Number 19  Points: 0.00/5.00
  743. Question Text
  744. An appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of a customer purchase for the models are as follows:
  745. x   13.5    15.9    19.1
  746. P(x)    0.2 0.5 0.3
  747. What is the mean size of the freezers purchased by all customers?
  748. A. 1
  749. B. 16.17
  750. C. 16.38
  751. D. 40.5
  752. Your Answer
  753. D. 40.5
  754. Question Number 20  Points: 5.00/5.00
  755. Question Text
  756. In a binomial model, if p = .27, what is the value of q?
  757. A. .27
  758. B. .63
  759. C. .73
  760. D. 1.0
  761. Your Answer
  762. C. .73
  763. Question Number 1   Points: 5.00/5.00
  764. Question Text
  765. A manufacturer makes ceramic heaters that have a life expectancy of 10 years. Two percent of the heaters are defective because they break down after the first month. If the manufacturing process is improved so that the number of defective units drops to 1%, how will the life expectancy of the heaters change?
  766. Your Answer
  767. C. The life expectancy will increase to more than 10 years.
  768. Question Number 2   Points: 0.00/5.00
  769. Question Text
  770. A milk bottling company is required by law to fill all bottles with volume of within 2% accuracy. What should the manager do to make sure this requirement is met?
  771.  
  772. Your Answer
  773. B.
  774. Minimize mean volume of milk in the bottles
  775.  
  776. Question Number 3   Points: 5.00/5.00
  777. Question Text
  778. Medical procedures A and B have success rates of 40% ± 2% and 40% ±5%, respectively. Which of the two procedures is riskier?
  779.  
  780. Your Answer
  781. B.
  782. Procedure B
  783.  
  784. Question Number 4   Points: 5.00/5.00
  785. Question Text
  786. Let X represent the outcome of a wheel of fortune that has whole numbers 0 to 50 on different slots. What is the expected outcome?
  787. Your Answer
  788. B. 25
  789. Question Number 5   Points: 5.00/5.00
  790. Question Text
  791. Let X represent the outcome of a single roll of a fair die. What is the expected value of the outcome?
  792. Your Answer
  793. C. 3.5
  794. Question Number 6   Points: 0.00/5.00
  795. Question Text
  796. Let X represent the outcome of a single roll of a fair die. Suppose you will win $2 if the outcome is either 2 or 5, and lose $1 otherwise. What are your expected winnings in 20 tosses?
  797. Your Answer
  798. B.
  799. You will lose $20.
  800.  
  801. Question Number 7   Points: 0.00/5.00
  802. Question Text
  803. About 5% of a certain type of wall nails made by a hardware supplier exceeds the requirement of being able to support 500 pounds of weight. The supplier decides to remove these nails and sell them as premium wall nails. What will happen to the expected weight that the regular nails can support?
  804. Your Answer
  805. C.
  806. It will be greater than 500 pounds.
  807.  
  808. Question Number 8   Points: 5.00/5.00
  809. Question Text
  810. Hockey team A is 1 point behind hockey team B with only 30 seconds left in the game. The coach of team A decides to pull the goalie to put him in a forward position. What happens to the expected value of team A scoring a goal, and the expected value of team B scoring a goal?
  811.  
  812. Your Answer
  813. C.
  814. Both expected values will increase.
  815.  
  816. Question Number 9   Points: 0.00/5.00
  817. Question Text
  818. A paint supply store has a certain type of paint in stock. It sells the paint to a customer in lots represented by X. Suppose X has the following distribution:
  819. x   1   2   3   4
  820. P(x)    0.2 0.4 0.3 0.1
  821. Compute the expected number of lots sold to a random customer.
  822. Your Answer
  823. D. 0.5
  824. Question Number 10  Points: 2.00/2.00
  825. Question Text
  826. You want to make a decision from 3 choices based on the outcome of the roll of a fair die. If the outcome is 1 or 2, you will pick choice A. If the outcome is 3 or 4, you will pick choice B. Otherwise, you will pick choice C. Is this a fair way to make a decision?
  827.  
  828. Your Answer
  829. True
  830. Question Number 1   Points: 5.00/5.00
  831. Question Text
  832. What do you call two events with a sum of 1?
  833. Your Answer
  834. A. Complementary events
  835. Question Number 2   Points: 0.00/5.00
  836. Question Text
  837. A card is chosen at random from a standard deck of 52 playing cards, which consists of 4 suits with 13 cards. If someone picks a card and tells you that it is a queen, what is the conditional probability that the card is a club?
  838. Your Answer
  839. A. 1/52
  840. Question Number 3   Points: 0.00/5.00
  841. Question Text
  842. Which is an example of theoretical probability?
  843. Your Answer
  844. B. You flipped a coin 100 times and got "tails" 70 times. The probability of getting "tails" on your next flip is 70%
  845. Question Number 4   Points: 0.00/5.00
  846. Question Text
  847. There are 20 players on a hockey team. 5 of them are rookies. Determine the probability that none of the rookies will be randomly selected to be included in the team's group of 6 starters.
  848. Your Answer
  849. A. 15 114
  850. Question Number 5   Points: 0.00/5.00
  851. Question Text
  852. Which of the following graphs is a valid probability distribution of a random variable over a week?
  853. Your Answer
  854. B.
  855. Question Number 6   Points: 0.00/5.00
  856. Question Text
  857. Two cards are drawn without replacement from a standard deck of 52 playing cards. Find the probability that the first is an odd number card (aces are considered odd because they have a value of 1 or 11) and the second is a face card.
  858. Your Answer
  859. B. (20/52)(12/52)
  860. Question Number 7   Points: 5.00/5.00
  861. Question Text
  862. Determine the probability of not getting a 5 when rolling a fair die.
  863. Your Answer
  864. D. 5/6
  865. Question Number 8   Points: 5.00/5.00
  866. Question Text
  867. A researcher wants to conduct a genetic study using 25 randomly-selected volunteers. He has a volunteer pool of 30, composed of 15 males and 15 females. What is the probability of 12 male and 13 female volunteers OR 13 male and 12 female volunteers being selected at random for the study?
  868. Your Answer
  869. D. 175/261
  870. Question Number 9   Points: 0.00/5.00
  871. Question Text
  872. A bag contains 5 blue and 3 green marbles. Marbles are drawn at random without replacement. Which of the following gives the probability of drawing a blue and then a green marble?
  873. Your Answer
  874. B. (3/8)(5/8)
  875. Question Number 10  Points: 5.00/5.00
  876. Question Text
  877. Two cards are drawn without replacement from a standard deck of 52 playing cards. Find the probability that the first is an odd number (aces are considered odd because they have a value of 1 or 11) and the second is a face card.
  878. Your Answer
  879. A. (20/52)(12/51)
  880. Question Number 11  Points: 0.00/5.00
  881. Question Text
  882. A researcher wants to conduct a genetic study using 10 randomly-selected volunteers. He has a volunteer pool of 20, composed of 10 males and 10 females. What is the probability that the randomly-selected group will be all male OR all female?
  883. Your Answer
  884. C. 5/138,567
  885. Question Number 12  Points: 5.00/5.00
  886. Question Text
  887. Two cards are drawn with replacement from a standard deck of 52 playing cards. Find the probability that the first card is a king and the second is a diamond.
  888. Your Answer
  889. B. (4/52)(13/52)
  890. Question Number 13  Points: 5.00/5.00
  891. Question Text
  892. What is the theoretical probability of rolling a number with a value of 4 or greater on a die?
  893. Your Answer
  894. D. 1/2
  895. Question Number 14  Points: 5.00/5.00
  896. Question Text
  897. What percentage of males prefer to drive on multi-lane highways with traffic lights?
  898.  
  899. Your Answer
  900. B. 25.5%
  901. Question Number 15  Points: 5.00/5.00
  902. Question Text
  903. Let the random variable A represent the outcome of a dice roll. Which of the following bar graphs correctly represent the probability distribution of A?
  904. Your Answer
  905. A.
  906. Question Number 16  Points: 5.00/5.00
  907. Question Text
  908. A card is chosen at random from a standard deck of 52 playing cards, which consist of 4 suits with 13 cards. If someone picks a card and tells you that it is a diamond, what is the conditional probability that the card is an ace?
  909. Your Answer
  910. B. 1/13
  911. Question Number 17  Points: 5.00/5.00
  912. Question Text
  913. Which of the following is represented by the intersection in the Venn diagram below?
  914. Your Answer
  915. D. A number between 4 and 7.
  916. Question Number 18  Points: 5.00/5.00
  917. Question Text
  918. Suppose a randomly-picked number is 11. Where is this number located in the Venn diagram below?
  919. Your Answer
  920. C. Inside the oval on the right, excluding the intersection
  921. Question Number 19  Points: 0.00/5.00
  922. Question Text
  923. Two cards are drawn without replacement from a standard deck of 52 playing cards. Find the probability that both are odd numbers (aces are considered odd because they have a value of 1 or 11).
  924. Your Answer
  925. D. (20/52)(4/51) + (4/52) (20/51)
  926. Question Number 20  Points: 0.00/5.00
  927. Question Text
  928. Lucy has a bag of M&Ms. There are 15 blue, 7 brown, 10 green, 13 orange, 5 red, and 6 yellow candies in her bag. What is the probability that she will get a green M&M by drawing a random candy from the bag?
  929. Your Answer
  930. D. 13 56
  931. Question Number 1   Points: 5.00/5.00
  932. Question Text
  933. Which of the following does the intersection in the Venn diagram below represent?
  934. Your Answer
  935. C. An event that is both A and B
  936. Question Number 2   Points: 0.00/2.00
  937. Question Text
  938. You want to make a decision from 3 choices based on the outcome of the roll of a fair die. If the outcome is 1 or 2, you will pick choice A. If the outcome is 3 or 4, you will pick choice B. Otherwise, you will pick choice C. Is this a fair way to make a decision?
  939.  
  940. Your Answer
  941. False
  942. Question Number 3   Points: 0.00/5.00
  943. Question Text
  944. You conduct an experiment where you roll a die and record the results. You roll the die 1230 times and the results are shown in the table below:
  945.  
  946. Result
  947.  
  948. Frequency
  949.  
  950. 1
  951.  
  952. 245
  953.  
  954. 2
  955.  
  956. 172
  957.  
  958. 3
  959.  
  960. 219
  961.  
  962. 4
  963.  
  964. 201
  965.  
  966. 5
  967.  
  968. 137
  969.  
  970. 6
  971.  
  972. 256
  973.  
  974.  
  975. What is the experimental probability of rolling a "1" on your next roll?
  976. Your Answer
  977. A. 0.1667
  978. Question Number 4   Points: 5.00/5.00
  979. Question Text
  980. Suppose that you would like to study the occurrence of obesity in high schools in your state. One of the high schools in your state was chosen at random and the students at that school were surveyed. What type of sampling is this using?
  981. Your Answer
  982. D. Cluster Sampling
  983. Question Number 5   Points: 0.00/5.00
  984. Question Text
  985. Find the correlation coefficient of the line of best fit for the points (-3, -40), (1, 12), (5, 72), (7, 137).
  986. Your Answer
  987. C. 16.9
  988. Question Number 6   Points: 5.00/5.00
  989. Question Text
  990. When there is no change in value from one data point to the next in a line graph, what type of slope does the line that connects them have?
  991. Your Answer
  992. D. Zero
  993. Question Number 7   Points: 5.00/5.00
  994. Question Text
  995. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats: {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the frequency of units with 2 rats?
  996. Your Answer
  997. C. 3
  998. Question Number 8   Points: 5.00/5.00
  999. Question Text
  1000. 100 AAA batteries were tested on a particular MP3 player. Suppose the battery has a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. How long do we expect the majority of batteries to last?
  1001. Your Answer
  1002. D. Between 28.8 and 34.6 hours
  1003. Question Number 9   Points: 5.00/5.00
  1004. Question Text
  1005. There are 7 quarters, 2 dimes, 5 nickels, and 11 pennies to choose from. What is the sample space?
  1006. Your Answer
  1007. A. 25
  1008. Question Number 10  Points: 2.00/2.00
  1009. Question Text
  1010. The mean can be greater than the largest number in a data set.
  1011. Your Answer
  1012. False
  1013. Question Number 11  Points: 0.00/5.00
  1014. Question Text
  1015. Two cards are drawn with replacement from a standard deck of 52 playing cards. Find the probability that the first card is a king and the second is a diamond.
  1016. Your Answer
  1017. C. (13/52)(13/52)
  1018. Question Number 12  Points: 5.00/5.00
  1019. Question Text
  1020. Identify the median on the box-and-whisker plot.
  1021.  
  1022. Click here for a long description of the image above.
  1023.  
  1024. Your Answer
  1025. C. 8
  1026. Question Number 13  Points: 0.00/5.00
  1027. Question Text
  1028. A survey question is worded as, "Congressmen make at least $100,000 more than the average American. Do you think congressmen make enough money?" What question-wording issue is this an example of?
  1029. Your Answer
  1030. C. Planting Ideas with Questions
  1031. Question Number 14  Points: 5.00/5.00
  1032. Question Text
  1033. To determine if eating a good breakfast improves performance on a standardized test, a study records scores from students who did eat a good breakfast and scores from those who did not. What type of study design is this an example of?
  1034. Your Answer
  1035. B. Observational Study
  1036. Question Number 15  Points: 5.00/5.00
  1037. Question Text
  1038. Question
  1039.  
  1040. Click here for a long description of the image above.
  1041.  
  1042. The bar graph shows the number of home runs Babe Ruth hit
  1043. from 1926 to 1930. By how much does the largest number of
  1044. home runs hit in a year exceed the smallest number of home
  1045. runs hit in a year?
  1046. Your Answer
  1047. B. 14
  1048. Question Number 16  Points: 5.00/5.00
  1049. Question Text
  1050. What is the definition of a variable?
  1051. Your Answer
  1052. C. Something that can be changed
  1053. Question Number 17  Points: 5.00/5.00
  1054. Question Text
  1055. Doctors want to determine the best medication for Alzheimer's, medication A or medication B. They randomly choose participants to be given one of the unmarked medications. Only the researchers know which participants were given which medication. Identify the type of experiment described.
  1056. Your Answer
  1057. B. Randomized controlled blind experiment
  1058. Question Number 18  Points: 5.00/5.00
  1059. Question Text
  1060. Describe the following scatterplot.
  1061.  
  1062. Your Answer
  1063. A. positive correlation
  1064. Question Number 19  Points: 0.00/5.00
  1065. Question Text
  1066. Find the exponential regression equation for the data points (-3, 8), (0, 5), (2, 4), and (5, 3).
  1067. Your Answer
  1068. B. y = 6.23(0.72)^x
  1069. Question Number 20  Points: 5.00/5.00
  1070. Question Text
  1071. Let the random variable A represent the outcome of a dice roll. Which of the following bar graphs correctly represent the probability distribution of A?
  1072. Your Answer
  1073. A.
  1074. Question Number 21  Points: 5.00/5.00
  1075. Question Text
  1076. A manufacturer makes ceramic heaters that have a life expectancy of 10 years. Two percent of the heaters are defective because they break down after the first month. If the manufacturing process is improved so that the number of defective units drops to 1%, how will the life expectancy of the heaters change?
  1077. Your Answer
  1078. C. The life expectancy will increase to more than 10 years.
  1079. Question Number 22  Points: 5.00/5.00
  1080. Question Text
  1081. Lucy has a bag of M&Ms. There are 15 blue, 7 brown, 10 green, 13 orange, 5 red, and 6 yellow candies in her bag. What is the probability that she will get an orange M&M by drawing a random candy from the bag?
  1082. Your Answer
  1083. B. 13 56
  1084. Question Number 23  Points: 5.00/5.00
  1085. Question Text
  1086. An appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of a customer purchase for the models are as follows:
  1087. x   13.5    15.9    19.1
  1088. P(x)    0.2 0.5 0.3
  1089. What is the mean size of the freezers purchased by all customers?
  1090. Your Answer
  1091. C. 16.38
  1092. Question Number 24  Points: 5.00/5.00
  1093. Question Text
  1094. What is the approximate conditional probability of someone preferring to drive on a two-lane highway with traffic lights, given that she is female?
  1095.  
  1096. Your Answer
  1097. B. 0.36
  1098. Question Number 25  Points: 5.00/5.00
  1099. Question Text
  1100. During the Jones’ 5 day vacation in Dallas, Texas, the average low temperature was 79°F. The low temperature on the first four days was 80, 81, 79, and 77. What was the temperature on the fifth day?
  1101. Your Answer
  1102. A. 78
  1103. Question Number 26  Points: 0.00/5.00
  1104. Question Text
  1105. The standardized mathematics scores of a certain school district are normally distributed with the mean of 500 and standard deviation 100. Find the probability that a score is greater than 700.
  1106. Your Answer
  1107. A. 1%
  1108. Question Number 27  Points: 0.00/5.00
  1109. Question Text
  1110. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula
  1111. Click here for a long description of the image above.
  1112.  
  1113.  
  1114. to determine the probability that they will win 4 of their next 5 games. What value will be substituted for "n" in the formula?
  1115. Your Answer
  1116. D. 75
  1117. Question Number 1   Points: 5.00/5.00
  1118. Question Text
  1119. Hockey team A is 1 point behind hockey team B with only 30 seconds left in the game. The coach of team A decides to pull the goalie to put him in a forward position. What happens to the expected value of team A scoring a goal, and the expected value of team B scoring a goal?
  1120.  
  1121. Your Answer
  1122. C.
  1123. Both expected values will increase.
  1124.  
  1125. Question Number 2   Points: 0.00/5.00
  1126. Question Text
  1127. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula
  1128. Click here for a long description of the image above.
  1129.  
  1130.  
  1131. to determine the probability that they will win 4 of their next 5 games. What value will be substituted for "n" in the formula?
  1132. Your Answer
  1133. C. 40
  1134. Question Number 3   Points: 0.00/5.00
  1135. Question Text
  1136. The formula associated with a binomial model is .
  1137. Click here for a long description of the image above.
  1138.  
  1139. What does the "q" in the formula represent?
  1140. Your Answer
  1141. C. probability of success
  1142. Question Number 4   Points: 0.00/5.00
  1143. Question Text
  1144. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula
  1145. Click here for a long description of the image above.
  1146.  
  1147.  
  1148. to determine the probability that they will win 4 of their next 5 games. What value will be substituted for "n" in the formula?
  1149. Your Answer
  1150. C. 40
  1151. Question Number 5   Points: 0.00/5.00
  1152. Question Text
  1153. The following two sets of measurements are for the weight of the same object in grams:
  1154.  
  1155. {2.0, 1.9, 2.1, 1.8, 2.0} {1.8, 1.8, 2.0, 2.2, 2.2} Which of these two sets of measurements is more reliable?
  1156. Your Answer
  1157. B.
  1158. The second set
  1159.  
  1160. Question Number 6   Points: 0.00/5.00
  1161. Question Text
  1162. About 5% of a certain type of wall nails made by a hardware supplier exceeds the requirement of being able to support 500 pounds of weight. The supplier decides to remove these nails and sell them as premium wall nails. What will happen to the expected weight that the regular nails can support?
  1163. Your Answer
  1164. B.
  1165. It will remain unchanged at 500 pounds.
  1166.  
  1167. Question Number 7   Points: 0.00/5.00
  1168. Question Text
  1169. A man lost a tooth due to dental problem. The dentist offers him two solutions: Live with the lost tooth for the rest of his life, or replace it with a titanium tooth replacement, which is very expensive. Which of the following should NOT be a factor in his decision making process?
  1170. Your Answer
  1171. D.
  1172. How many years the titanium implant may last
  1173.  
  1174. Question Number 8   Points: 0.00/5.00
  1175. Question Text
  1176. A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of customer purchase for the models are as follows:
  1177. x   13.5    15.9    19.1
  1178. P(x)    0.2 0.5 0.3 Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 5% smaller. What is the mean actual size of the freezers purchased by all customers?
  1179. Your Answer
  1180. C. 16.4
  1181. Question Number 9   Points: 0.00/5.00
  1182. Question Text
  1183. A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively.  Suppose the probabilities of customer purchase for the models are as follows:
  1184.  
  1185. x   13.5    15.9    19.1
  1186. P(x)    0.2 0.5 0.3 Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 5% smaller. What is the standard deviation in the actual size of the freezers purchased by all customers?
  1187. Your Answer
  1188. C. 3.8
  1189. Question Number 10  Points: 0.00/5.00
  1190. Question Text
  1191. A paint supply store has a certain type of paint in stock. It sells the paint to a customer in lots represented by X. Suppose X has the following distribution:
  1192. x   1   2   3   4
  1193. P(x)    0.2 0.4 0.3 0.1
  1194. Compute the expected number of lots sold to a random customer.
  1195. Your Answer
  1196. B. 2.5
  1197. Question Number 11  Points: 5.00/5.00
  1198. Question Text
  1199. The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability that a score is more than 890.
  1200. Your Answer
  1201. B. 2.28%
  1202. Question Number 12  Points: 0.00/5.00
  1203. Question Text
  1204. Let X represent the outcome of a single roll of a fair die. Suppose you will win $2 if the outcome is either 2 or 5, and lose $1 otherwise. What are your expected winnings in 20 tosses?
  1205. Your Answer
  1206. C.
  1207. You will win $10.
  1208.  
  1209. Question Number 13  Points: 0.00/5.00
  1210. Question Text
  1211. Let X represent the outcome of a single roll of a fair die. Suppose you will win $2 if the outcome is 5, and lose $1 otherwise. What can you expect to win tossing the coin 20 times?
  1212. Your Answer
  1213. A.
  1214. You will not win or lose any money.
  1215.  
  1216. Question Number 14  Points: 5.00/5.00
  1217. Question Text
  1218. The life expectancy of a certain tire is a normal distribution with the mean = 40,000 miles, standard deviation is 1,000 miles. Find the probability that a tire will last more than 39,000 miles.
  1219. Your Answer
  1220. D. 84.1%
  1221. Question Number 15  Points: 5.00/5.00
  1222. Question Text
  1223. The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability that a score is less than 610.
  1224. Your Answer
  1225. B. 2.28%
  1226. Question Number 16  Points: 0.00/5.00
  1227. Question Text
  1228. The formula associated with a binomial model is .
  1229. Click here for a long description of the image above.
  1230.  
  1231. What does the "n" in the formula represent?
  1232. Your Answer
  1233. C. probability of success
  1234. Question Number 17  Points: 5.00/5.00
  1235. Question Text
  1236. The life expectancy of a certain tire is a normal distribution with the mean = 40,000 miles, standard deviation is 1,000 miles. Find the probability that a tire will last between 38,000 and 42,000 miles.
  1237. Your Answer
  1238. C. 95.5%
  1239. Question Number 18  Points: 0.00/5.00
  1240. Question Text
  1241. The life expectancy of a certain tire is a normal distribution with the mean = 40,000 miles, standard deviation is 1,000 miles. Find the probability that a tire will last between 39,000 and 41,000 miles.
  1242. Your Answer
  1243. D. 84.1%
  1244. Question Number 19  Points: 0.00/5.00
  1245. Question Text
  1246. An appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of a customer purchase for the models are as follows:
  1247. x   13.5    15.9    19.1
  1248. P(x)    0.2 0.5 0.3
  1249. What is the mean size of the freezers purchased by all customers?
  1250. Your Answer
  1251. B. 16.17
  1252. Question Number 20  Points: 0.00/5.00
  1253. Question Text
  1254. In a binomial model, if p = .27, what is the value of q?
  1255. Your Answer
  1256. B. .63
  1257. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula
  1258.  
  1259. Question Number 1   Points: 5.00/5.00
  1260. Question Text
  1261. Question
  1262. There are 5 red socks, 2 white socks and 3 blue socks in a basket.  What is the probability of picking a pair of red socks?
  1263. Your Answer
  1264. A. 2 ninths
  1265. Question Number 2   Points: 0.00/5.00
  1266. Question Text
  1267. When playing a game, the winner must roll a number less than 3 or more than 4. What is the probability of a person winning the game?
  1268. Your Answer
  1269. A. 1/9
  1270. Question Number 3   Points: 0.00/5.00
  1271. Question Text
  1272. Question
  1273. 6 sided die and 4 section spinner, numbered 1, 2, 3, and 4
  1274. David rolls a die and spins the spinner shown. What is the
  1275. probability that he gets a 1 on both the die and the spinner?
  1276. Your Answer
  1277. C. 5 twelfths
  1278. Question Number 4   Points: 0.00/5.00
  1279. Question Text
  1280. Two cards are drawn with replacement from a standard deck of 52 playing cards. Find the probability that both are kings.
  1281. Your Answer
  1282. C. (13/52)(39/52) + (39/52) (13/52)
  1283. Question Number 5   Points: 5.00/5.00
  1284. Question Text
  1285. Question
  1286. You toss a penny, nickel, dime and quarter. What is the probability of all four landing tails?
  1287. Your Answer
  1288. D. 1 sixteenth
  1289. Question Number 6   Points: 5.00/5.00
  1290. Question Text
  1291. Question
  1292. A standard deck of playing cards has 52 cards - 13 spades, 13
  1293. clubs, 13 hearts, and 13 diamonds. What is the probability of
  1294. drawing a spade from a standard 52-card deck, replacing it, and
  1295. then drawing another spade?
  1296. Your Answer
  1297. C. 1 16
  1298. Question Number 7   Points: 5.00/5.00
  1299. Question Text
  1300. Question
  1301. The word "independent" is spelled out on index cards, one letter
  1302. per card. Ken randomly selects a card and does not replace it,
  1303. and then Barb randomly selects a card. What is the probability
  1304. that they both get a card with an "e" written on it?
  1305. Your Answer
  1306. A. 3 55
  1307. Question Number 8   Points: 0.00/5.00
  1308. Question Text
  1309. Question
  1310. The chart shows the membership in the High School Band.  What is the probability that a boy and a girl chosen randomly will both be seniors?
  1311.  
  1312.  
  1313. HS Band
  1314.  
  1315. Freshmen
  1316.  
  1317. Sophomores
  1318.  
  1319. Juniors
  1320.  
  1321. Seniors
  1322.  
  1323. Boys
  1324.  
  1325. 10
  1326.  
  1327. 7
  1328.  
  1329. 10
  1330.  
  1331. 9
  1332.  
  1333. Girls
  1334.  
  1335. 8
  1336.  
  1337. 11
  1338.  
  1339. 9
  1340.  
  1341. 7
  1342.  
  1343.  
  1344. Your Answer
  1345. B. 1 fifth
  1346. Question Number 9   Points: 0.00/5.00
  1347. Question Text
  1348. Question
  1349. Three cards are drawn from a deck of fifteen cards numbered 1 through 15. Once a card is selected, it is not replaced. What is the probability of drawing three odd numbers in a row?
  1350. Your Answer
  1351. A. 8 fifteenths
  1352. Question Number 10  Points: 5.00/5.00
  1353. Question Text
  1354. You are taking a 30-question multiple-choice exam that you have not studied for. You will have to guess on every question. Identify the correct event type for this situation.
  1355. Your Answer
  1356. A. Independent
  1357. Question Number 1   Points: 5.00/5.00
  1358. Question Text
  1359. Dustin is getting ready for a job interview. He has 3 pairs of slacks, 4 shirts, and 2 ties to choose from. What is the probability that his outfit will contain the first pair of slacks, fourth shirt, and second tie?
  1360. Your Answer
  1361. A. 1 24
  1362. Question Number 2   Points: 5.00/5.00
  1363. Question Text
  1364. Suppose a sample space represents the following objects: {airplanes, gliders, helicopters, rockets}. Which of the following does the region outside the oval in the Venn diagram below represent?
  1365. Your Answer
  1366. D. Airplanes, helicopters, and rockets
  1367. Question Number 3   Points: 5.00/5.00
  1368. Question Text
  1369. Suppose a randomly-picked number is 1. Where is this number located in the Venn diagram below?
  1370. Your Answer
  1371. A. Inside the circle on the left, excluding the intersection
  1372. Question Number 4   Points: 5.00/5.00
  1373. Question Text
  1374. Lucy has a bag of M&Ms. There are 15 blue, 7 brown, 10 green, 13 orange, 5 red, and 6 yellow candies in her bag. What is the probability that she will get a red M&M by drawing a random candy from the bag?
  1375. Your Answer
  1376. C. 5 56
  1377. Question Number 5   Points: 0.00/5.00
  1378. Question Text
  1379. Lucy has a bag of M&Ms. There are 15 blue, 7 brown, 10 green, 13 orange, 5 red, and 6 yellow candies in her bag. What is the probability that she will get a green M&M by drawing a random candy from the bag?
  1380. Your Answer
  1381. B. 7 56
  1382. Question Number 6   Points: 5.00/5.00
  1383. Question Text
  1384. Suppose a randomly-picked number is 5. Where is this number located in the Venn diagram below?
  1385.  
  1386. Your Answer
  1387. B. Inside the intersection
  1388. Question Number 7   Points: 0.00/5.00
  1389. Question Text
  1390. There are 20 players on the school's water polo team. 8 of them are freshmen. The coach needs 8 starters. Determine the probability that the 8 freshmen will be randomly selected to be starters.
  1391. Your Answer
  1392. C. 7 41,990
  1393. Question Number 8   Points: 0.00/5.00
  1394. Question Text
  1395. Dustin is getting ready for a job interview. He has 3 pairs of slacks, 4 shirts, and 2 ties to choose from. What is the probability of his outfit containing the second pair of slacks, third shirt, and first tie?
  1396. Your Answer
  1397. B. 1 9
  1398. Question Number 9   Points: 5.00/5.00
  1399. Question Text
  1400. Which of the following is represented by the intersection in the Venn diagram below?
  1401. Your Answer
  1402. D. A number between 4 and 7.
  1403. Question Number 10  Points: 0.00/5.00
  1404. Question Text
  1405. An animal is randomly picked from all animals. Two of these possible animals are an elephant and a mouse. Which of the following is the correct way to draw a Venn diagram depicting the sample space and the diagram?
  1406. Your Answer
  1407. B.
  1408.  
  1409. Question Number 1   Points: 5.00/5.00
  1410. Question Text
  1411. What is the sum of the probabilities of all possible outcomes?
  1412. Your Answer
  1413. B. 1
  1414. Question Number 2   Points: 0.00/5.00
  1415. Question Text
  1416. What is the probability of rolling a number between 1 and 6, inclusive, on a fair die?
  1417. Your Answer
  1418. A. 1/6
  1419. Question Number 3   Points: 0.00/5.00
  1420. Question Text
  1421. Your little brother bets you that if he flips a coin 4 times, he will get "heads", 3 times. You know the theoretical probability is in your favor. Which of the following is your best response to his challenge?
  1422. Your Answer
  1423. C. Flip a coin 4 times yourself and then decide
  1424. Question Number 4   Points: 0.00/5.00
  1425. Question Text
  1426. What is the probability of rolling a 7 on a fair die?
  1427. Your Answer
  1428. B. 1/6
  1429. Question Number 5   Points: 5.00/5.00
  1430. Question Text
  1431. What is the probability of rolling an even number on a fair die?
  1432. Your Answer
  1433. C. 1/2
  1434. Question Number 6   Points: 5.00/5.00
  1435. Question Text
  1436. Determine the probability of drawing a club from a regular deck of cards.
  1437. Your Answer
  1438. B. 1/4
  1439. Question Number 7   Points: 0.00/5.00
  1440. Question Text
  1441. Which of the following tables is definitely NOT a valid probability distribution of a random variable?
  1442. Your Answer
  1443. B.
  1444. Question Number 8   Points: 0.00/5.00
  1445. Question Text
  1446. What is the theoretical probability of rolling a number with a value of 4 or greater on a die?
  1447. Your Answer
  1448. B. 1/3
  1449. Question Number 9   Points: 0.00/5.00
  1450. Question Text
  1451. Which is an example of theoretical probability?
  1452. Your Answer
  1453. D. You roll a die 10 times and get a result of 5 three times. You determine that there is a 30% of rolling a 5 on the next roll
  1454. Question Number 10  Points: 0.00/5.00
  1455. Question Text
  1456. Which of the following tables is definitely NOT a valid probability distribution of a random variable?
  1457. Your Answer
  1458. B.
  1459. Question Number 11  Points: 5.00/5.00
  1460. Question Text
  1461. What is the theoretical probability of drawing an ace from a standard deck of playing cards?
  1462. Your Answer
  1463. B. 1/13
  1464. Question Number 12  Points: 5.00/5.00
  1465. Question Text
  1466. You conduct an experiment where you roll a die and record the results. You roll the die 1230 times and the results are shown in the table below:
  1467.  
  1468. Result
  1469.  
  1470. Frequency
  1471.  
  1472. 1
  1473.  
  1474. 245
  1475.  
  1476. 2
  1477.  
  1478. 172
  1479.  
  1480. 3
  1481.  
  1482. 219
  1483.  
  1484. 4
  1485.  
  1486. 201
  1487.  
  1488. 5
  1489.  
  1490. 137
  1491.  
  1492. 6
  1493.  
  1494. 256
  1495.  
  1496.  
  1497. What is the theoretical probability of rolling a "1" on your next roll?
  1498. Your Answer
  1499. C. 0.1667
  1500. Question Number 1   Points: 0.00/5.00
  1501. Question Text
  1502.  
  1503. Which of these pairs of variables would you expect to be
  1504. represented by a scatterplot with a negative correlation?
  1505. Your Answer
  1506. D. The cost a telephone call and the length of the call.
  1507. Question Number 2   Points: 0.00/5.00
  1508. Question Text
  1509. A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 12.8 grams of radioactive substance. 9 days later, there are 7.33 grams. After 14 days, there are 5.38 grams. After 30 days, there are 2.00 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days and use the equation to determine the amount of radioactive material remaining after 50 days.
  1510. Your Answer
  1511. A. 0.56 g
  1512. Question Number 3   Points: 5.00/5.00
  1513. Question Text
  1514. Describe the following scatterplot.
  1515.  
  1516. Your Answer
  1517. B. negative correlation
  1518. Question Number 4   Points: 5.00/5.00
  1519. Question Text
  1520. What is the value of a in the quadratic regression equation for these points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  1521. Your Answer
  1522. C. -2.4
  1523. Question Number 5   Points: 5.00/5.00
  1524. Question Text
  1525. Describe the following scatterplot.
  1526.  
  1527. Your Answer
  1528. B. negative correlation
  1529. Question Number 6   Points: 5.00/5.00
  1530. Question Text
  1531. Ft. Clyman General Hospital created a scatter plot to illustrate the number of babies that were born in the maternity ward over the past several years. The data for 1996 was missing. According to the scatter plot, approximately how many babies do you predict were born during 1996?
  1532.  
  1533.  
  1534. Your Answer
  1535. B. 700
  1536. Question Number 7   Points: 0.00/5.00
  1537. Question Text
  1538. Find the equation of the line of best fit for the points (-3, -40), (1, 12), (5, 72), (7, 137).
  1539. Your Answer
  1540. C. y = 17x - 3
  1541. Question Number 8   Points: 5.00/5.00
  1542. Question Text
  1543. Ft. Clyman General Hospital created a scatter plot to illustrate the number of babies that were born in the maternity ward over the past several years. The data for 1999 was missing. According to the scatter plot, approximately how many babies do you predict were born during 1999?
  1544.  
  1545.  
  1546. Your Answer
  1547. C. 800
  1548. Question Number 9   Points: 5.00/5.00
  1549. Question Text
  1550. Find the correlation coefficient of the line of best fit for the points (-4, 10), (-1, 5), (2, -1), (3, -6) and (5, -7).
  1551. Your Answer
  1552. B. -0.98
  1553. Question Number 10  Points: 5.00/5.00
  1554. Question Text
  1555. A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 6.2 grams of radioactive substance. 12 days later, there are 6.16 grams. After 19 days, there are 6.13 grams. After 46 days, there are 5.92 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days.
  1556. Your Answer
  1557. C. y = 6.23(0.999)x
  1558. Question Number 11  Points: 5.00/5.00
  1559. Question Text
  1560. What is the value of b in the quadratic regression equation for these points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  1561. Your Answer
  1562. D. 26.06
  1563. Question Number 12  Points: 0.00/5.00
  1564. Question Text
  1565. What is the quadratic regression equation for the points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  1566. Your Answer
  1567. B. y = -2.40x^2 + 26.06x + 40.83
  1568. Question Number 13  Points: 0.00/5.00
  1569. Question Text
  1570. In 1990, there were 1,650 cell phone subscribers in San Antonio, Texas. In 1994, there were 5,010 and in 1999, there were 20,075. Assuming that this is exponential growth, find the exponential regression equation and use it to find the number of cell phone subscribers in 2015. Round to the nearer thousand.
  1571. Your Answer
  1572. C. 4,204,771
  1573. Question Number 14  Points: 0.00/5.00
  1574. Question Text
  1575. Find the equation of the line of best fit for the points (-4, 10), (-1, 5), (2, -1), (3, -6) and (5, -7).
  1576. Your Answer
  1577. C. y = 2x - 0.98
  1578. Question Number 15  Points: 0.00/5.00
  1579. Question Text
  1580.  
  1581. Which of these pairs of variables would you expect to be
  1582. represented by a scatterplot with a positive correlation?
  1583. Your Answer
  1584. D. The number of concert tickets purchased and the number of
  1585. concert tickets still available for purchase.
  1586. Question Number 16  Points: 5.00/5.00
  1587. Question Text
  1588. Which scatterplot shows a positive correlation?
  1589. Your Answer
  1590. A.
  1591. Question Number 17  Points: 5.00/5.00
  1592. Question Text
  1593. Find the exponential regression equation for the data points (-4, 0.75), (-2, 6), (3, 28), and (5, 162).
  1594. Your Answer
  1595. B. y = 9.17(1.70)^x
  1596. Question Number 18  Points: 0.00/5.00
  1597. Question Text
  1598. What is the value of b in the quadratic regression equation for these points: (-3, 1.2), (1, 0.4), (5, 1.6), (11, 2.6)?
  1599. Your Answer
  1600. D. 0.009
  1601. Question Number 19  Points: 5.00/5.00
  1602. Question Text
  1603. What does it mean if a is negative in the quadratic regression equation?
  1604. Your Answer
  1605. B. The equation makes a curve that opens down.
  1606. Question Number 20  Points: 0.00/5.00
  1607. Question Text
  1608. Find the exponential regression equation for the data points (-3, 8), (0, 5), (2, 4), and (5, 3).
  1609. Your Answer
  1610. C. y = 5(0.92)^x
  1611. Quest
  1612. Question Number 1   Points: 5.00/5.00
  1613. Question Text
  1614. What is the value of a in the quadratic regression equation for these points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  1615. Your Answer
  1616. C. -2.4
  1617. Question Number 2   Points: 0.00/5.00
  1618. Question Text
  1619. In 1985, there were 285 cell phone subscribers in Cleveland, Ohio. In 1988, there were 1,527 and in 1994, there were 43,871. Assuming that this is exponential growth, find the exponential regression equation and use it to find the number of cell phone subscribers in 1990. Round to the nearer hundred.
  1620. Your Answer
  1621. B. 6,600
  1622. Question Number 3   Points: 0.00/5.00
  1623. Question Text
  1624. What is the value of a in the quadratic regression equation for these points: (-3, 1.2), (1, 0.4), (5, 1.6), (11, 2.6)?
  1625. Your Answer
  1626. C. 0.29
  1627. Question Number 4   Points: 0.00/5.00
  1628. Question Text
  1629. What is the quadratic regression equation for the points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  1630. Your Answer
  1631. A. y = 2.40x^2 + 26.06x + 40.82
  1632. Question Number 5   Points: 0.00/5.00
  1633. Question Text
  1634. A biologist is researching a newly-discovered species of bacteria. At time t = 0 hours, he puts 100 bacteria into what he has determined to be a favorable growth medium. Six hours later, he measures 240 bacteria. Assuming exponential growth, what is the equation to determine the number of bacteria after x hours?
  1635. Your Answer
  1636. C. y = 100(2.4)^t
  1637. Question Number 6   Points: 0.00/5.00
  1638. Question Text
  1639. A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 12.8 grams of radioactive substance. 9 days later, there are 7.33 grams. After 14 days, there are 5.38 grams. After 30 days, there are 2.00 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days and use the equation to determine the amount of radioactive material remaining after 50 days.
  1640. Your Answer
  1641. C. 3.27 g
  1642. Question Number 7   Points: 0.00/5.00
  1643. Question Text
  1644. A biologist is researching a newly-discovered species of bacteria. He puts 1,000 bacteria into what he has determined to be a favorable growth medium. Twelve hours later, he measures 12,500 bacteria. Assuming exponential growth, find the growth equation and use it to determine the number of bacteria after twenty hours.
  1645. Your Answer
  1646. D. 78,324ion Number 1   Points: 5.00/5.00
  1647. Question Text
  1648.  
  1649. Which of these scatterplots shows a negative correlation?
  1650. Your Answer
  1651. A.
  1652. Question Number 2   Points: 5.00/5.00
  1653. Question Text
  1654.  
  1655. Which of these scatterplots does not show a correlation between
  1656. the data?
  1657. Your Answer
  1658. B.
  1659. Question Number 3   Points: 5.00/5.00
  1660. Question Text
  1661. The city of Harmonville created a scatter plot to illustrate the number of robberies that have been reported there over the past several years. The data for 2006 was missing. According to the scatter plot, how many reported robberies do you predict occurred during 2006?
  1662.  
  1663.  
  1664. Your Answer
  1665. B. 1,200
  1666. Question Number 4   Points: 5.00/5.00
  1667. Question Text
  1668.  
  1669. Which of these pairs of variables would you expect to be
  1670. represented by a scatterplot that shows no correlation?
  1671. Your Answer
  1672. B. The amount of money spent to make a film and the number of
  1673. people who pay to see it.
  1674. Question Number 5   Points: 5.00/5.00
  1675. Question Text
  1676.  
  1677. Which of these scatterplots shows a positive correlation?
  1678. Your Answer
  1679. C.
  1680. Question Number 6   Points: 5.00/5.00
  1681. Question Text
  1682. Forest Pointe College created a scatter plot to illustrate how its enrollment has declined over the past several years. Which of the following scatter plots has the most appropriate line of best fit?
  1683. Your Answer
  1684. B.
  1685. Question Number 7   Points: 5.00/5.00
  1686. Question Text
  1687. The scatter plot below shows the crime index for various cities as compared to their populations. According to the scatter plot, what would you predict would be the crime index for a city with a population of 220,000?
  1688.  
  1689.  
  1690. Your Answer
  1691. C. 500
  1692. Question Number 8   Points: 0.00/5.00
  1693. Question Text
  1694. Clive keeps track of his gas mileage for every trip he takes. He has plotted the information on a scatter plot. What is the slope of the line of best fit?
  1695.  
  1696.  
  1697. Your Answer
  1698. A. 1/50
  1699. Question Number 9   Points: 5.00/5.00
  1700. Question Text
  1701. The table represents a comparison of cat years to human years.  Draw a scatterplot and tell the relationship of the data.
  1702.  
  1703.  
  1704.  
  1705. Cat Years   1   3   4   6   7
  1706. Human Years 13  33  43  63 
  1707. 73
  1708.  
  1709.  
  1710.  
  1711. Your Answer
  1712. A. positive correlation
  1713. Question Number 10  Points: 5.00/5.00
  1714. Question Text
  1715. Scott plays video games every day after school. It seems like the more he plays, the better his scores get. The scatter plot below compares Scott’s high scores to the amount of time he’s played. According to the scatter plot, what would Scott’s high score be when he’s played for 60 hours?
  1716.  
  1717.  
  1718. Your Answer
  1719. A. 140
  1720. Question Number 1   Points: 0.00/5.00
  1721. Question Text
  1722. The city transit bus is supposed to arrive at a bus stop at 15 minutes past the hour every hour. If the arrival time has a standard deviation of 4 minutes, when should you expect the bus to arrive?
  1723. Your Answer
  1724. D. Between 11 and 15 minutes past the hour
  1725. Question Number 2   Points: 0.00/5.00
  1726. Question Text
  1727. A survey question is worded as, "Congressmen make at least $100,000 more than the average American. Do you think congressmen make enough money?" What question-wording issue is this an example of?
  1728. Your Answer
  1729. D. Complicated Questions
  1730. Question Number 3   Points: 5.00/5.00
  1731. Question Text
  1732. According to the bar graph, which country can expect to have the greatest growth in total population from 1950 to 2050?
  1733.  
  1734.  
  1735. Click here for a long description of the image above.
  1736.  
  1737. Your Answer
  1738. C. Egypt
  1739. Question Number 4   Points: 5.00/5.00
  1740. Question Text
  1741. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats: {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the frequency of units with 2 rats?
  1742. Your Answer
  1743. C. 3
  1744. Question Number 5   Points: 5.00/5.00
  1745. Question Text
  1746. When there is an increase from one data point to the next in a line graph, what type of slope does the line that connects them have?
  1747. Your Answer
  1748. B. Positive
  1749. Question Number 6   Points: 5.00/5.00
  1750. Question Text
  1751. To determine the effectiveness of an exercise plan on weight-loss, participants are divided into two groups. One group is given an exercise plan and the second group is responsible for creating their own exercise plan. After 8 weeks, the results of the participants in each group are observed. What type of study design is this an example of?
  1752. Your Answer
  1753. C. Experiment
  1754. Question Number 7   Points: 5.00/5.00
  1755. Question Text
  1756. You are making a line graph for the following table of hourly temperatures.
  1757.  
  1758. 3:00pm
  1759.  
  1760. 4:00pm
  1761.  
  1762. 5:00pm
  1763.  
  1764. 6:00pm
  1765.  
  1766. 7:00pm
  1767.  
  1768. 73˚
  1769.  
  1770. 78˚
  1771.  
  1772. 81˚
  1773.  
  1774. 84˚
  1775.  
  1776. 73˚
  1777.  
  1778. Which of the following is an ordered pair that you would use to make the graph?
  1779. Your Answer
  1780. B. (3, 73)
  1781. Question Number 8   Points: 5.00/5.00
  1782. Question Text
  1783. 100 AAA batteries were tested on a particular MP3 player. Suppose the batteries have a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. If a battery manufacturer wants all batteries to perform closer to the mean, which of the following should he do?
  1784. Your Answer
  1785. B. Improve the manufacturing process so the standard deviation is decreased.
  1786. Question Number 9   Points: 5.00/5.00
  1787. Question Text
  1788. To determine if eating a good breakfast improves performance on a standardized test, a study records scores from students who did eat a good breakfast and scores from those who did not. What type of study design is this an example of?
  1789. Your Answer
  1790. B. Observational Study
  1791. Question Number 10  Points: 5.00/5.00
  1792. Question Text
  1793. The pie chart below shows the results of a survey of 120 people.
  1794. Circle chart with 4 sectors:  Republican 36 %, Democrat 31 percent, Independent 18 %, and not registered 15 %.
  1795. How many people in the survey are registered as independent of a party? Be sure to round decimal answers to the nearest whole number.
  1796. Your Answer
  1797. B. 22
  1798. Question Number 11  Points: 5.00/5.00
  1799. Question Text
  1800. A survey was conducted at your workplace to gather opinions about proposed health care reforms. A look at the raw data showed these results:
  1801.  
  1802.  Agree              Disagree     No Opinion     Disagree  
  1803.  Disagree   Disagree    Agree   Disagree  
  1804.  Agree  No Opinion      Agree               Disagree
  1805.  Disagree   Agree               Disagree    No Opinion    
  1806. Which of the following pie charts most closely represents the results of the survey?
  1807. Your Answer
  1808. C.
  1809. Question Number 12  Points: 5.00/5.00
  1810. Question Text
  1811. Which of the following are valid random samples when picking an item from a cabinet of food?
  1812. Your Answer
  1813. D. {Salt, sugar, oatmeal, canned soup}
  1814. Question Number 13  Points: 0.00/5.00
  1815. Question Text
  1816. Doctors want to determine the best method for losing weight, dieting or exercising. They randomly choose participants to diet or exercise. Identify the type of experiment described.
  1817. Your Answer
  1818. B. Randomized controlled blind experiment
  1819. Question Number 14  Points: 5.00/5.00
  1820. Question Text
  1821. Which of the following values is NOT included in the data set illustrated by this stem-and-leaf plot?
  1822.  
  1823. Click here for a long description of the image above.
  1824.  
  1825. Your Answer
  1826. C. 115
  1827. Question Number 15  Points: 5.00/5.00
  1828. Question Text
  1829. When ordering a pizza, you can choose from 3 crusts, 5 cheeses, 3 meats, and 12 extra toppings. How many different pizzas can be created using only one option from each category?
  1830. Your Answer
  1831. B. 540
  1832. Question Number 16  Points: 5.00/5.00
  1833. Question Text
  1834. Justin is bowling in a tournament. To make it to the second round, he needs to average a score of 140 for 5 games. He bowled scores of 125, 156, 137, and 170 in his first 4 games. What does he need to score in the 5th game to make it to the second round?
  1835. Your Answer
  1836. B. 112
  1837. Question Number 17  Points: 5.00/5.00
  1838. Question Text
  1839. Jacob has a mean score of 78 after his first four math tests. He wants to make a B, or an average of 80, in math. What does he need to score on the fifth test to have a mean score of 80?
  1840. Your Answer
  1841. B. 88
  1842. Question Number 18  Points: 0.00/5.00
  1843. Question Text
  1844. There are 7 quarters, 2 dimes, 5 nickels, and 11 pennies to choose from. What is the sample space?
  1845. Your Answer
  1846. B. 770
  1847. Question Number 19  Points: 5.00/5.00
  1848. Question Text
  1849. Identify the upper extreme on the box-and-whisker plot.
  1850.  
  1851. Click here for a long description of the image above.
  1852.  
  1853. Your Answer
  1854. D. 10
  1855. Question Number 20  Points: 2.00/2.00
  1856. Question Text
  1857. The mean can be greater than the largest number in a data set.
  1858. Your Answer
  1859. False
  1860. Question Number 21  Points: 5.00/5.00
  1861. Question Text
  1862. 100 AAA batteries were tested on a particular MP3 player. Suppose the battery has a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. How long do we expect the majority of batteries to last?
  1863. Your Answer
  1864. D. Between 28.8 and 34.6 hours
  1865. Question Number 22  Points: 5.00/5.00
  1866. Question Text
  1867. According to the bar graph, how many countries had an increase in population from 1950 to 2000 and can expect to have an increase from 2000 to 2050?
  1868.  
  1869.  
  1870. Click here for a long description of the image above.
  1871.  
  1872. Your Answer
  1873. C. 3
  1874. Question Number 23  Points: 5.00/5.00
  1875. Question Text
  1876. Suppose that you would like to study the occurrence of obesity in high schools in your state. One of the high schools in your state was chosen at random and the students at that school were surveyed. What type of sampling is this using?
  1877. Your Answer
  1878. D. Cluster Sampling
  1879. Question Number 24  Points: 5.00/5.00
  1880. Question Text
  1881. What is the definition of a variable?
  1882. Your Answer
  1883. C. Something that can be changed
  1884. Question Number 25  Points: 0.00/5.00
  1885. Question Text
  1886. Doctors want to determine the best medication for Alzheimer's, medication A or medication B. They randomly choose participants to be given one of the unmarked medications. Only the researchers know which participants were given which medication. Identify the type of experiment described.
  1887. Your Answer
  1888. A. Randomized controlled experiment
  1889. Question Number 1   Points: 0.00/5.00
  1890. Question Text
  1891. A researcher wants to determine the best method for teaching college students: traditional campus classes or online classes. The researcher chooses to observe the final exam grades of fifty college students enrolled in both types of courses. What would be the lurking variable in this study?
  1892. Your Answer
  1893. B. The grades on final exams
  1894. Question Number 2   Points: 0.00/5.00
  1895. Question Text
  1896. A survey asks the question, "I don't buy magazines if unless I see an article I would like to read." What question-wording issue is this an example of?
  1897. Your Answer
  1898. A. Unbalanced Response Options
  1899. Question Number 3   Points: 5.00/5.00
  1900. Question Text
  1901. Restaurant patrons are asked to fill out a comment card rating the service they received. This is an example of what type of study design?
  1902. Your Answer
  1903. A. Survey
  1904. Question Number 4   Points: 5.00/5.00
  1905. Question Text
  1906. What is the definition of a variable?
  1907. Your Answer
  1908. C. Something that can be changed
  1909. Question Number 5   Points: 0.00/5.00
  1910. Question Text
  1911. To determine if eating a good breakfast improves performance on a standardized test, a study records scores from students who did eat a good breakfast and scores from those who did not. What type of study design is this an example of?
  1912. Your Answer
  1913. C. Experiment
  1914. Question Number 6   Points: 0.00/5.00
  1915. Question Text
  1916. A survey question is worded as, "Congressmen make at least $100,000 more than the average American. Do you think congressmen make enough money?" What question-wording issue is this an example of?
  1917. Your Answer
  1918. C. Planting Ideas with Questions
  1919. Question Number 7   Points: 0.00/5.00
  1920. Question Text
  1921. What is the dependent variable in an experiment?
  1922. Your Answer
  1923. B. The part of the experiment that is influenced and assigned to the participants
  1924. Question Number 8   Points: 0.00/5.00
  1925. Question Text
  1926. Suppose that you would like to study the occurrence of obesity in high schools in your state. One of the high schools in your state was chosen at random and the students at that school were surveyed. What type of sampling is this using?
  1927. Your Answer
  1928. C. Simple Random Sampling
  1929. Question Number 9   Points: 5.00/5.00
  1930. Question Text
  1931. A study of college tuition costs is being conducted. Ten colleges around the United States are selected at random and all of the students enrolled at those schools are selected to participate in the study. What type of sampling is this using?
  1932. Your Answer
  1933. D. Cluster Sampling
  1934. Question Number 10  Points: 0.00/5.00
  1935. Question Text
  1936. What is the control group of an experiment?
  1937. Your Answer
  1938. A. The data recorded about the participants' behavior
  1939.  
  1940. Question Number 1   Points: 0.00/5.00
  1941. Question Text
  1942. A survey asks, "Have you helped someone cheat on their taxes?" How could this question-wording issue be fixed?
  1943. Your Answer
  1944. C. It could be reworded: "I would never help someone cheat on their taxes unless there was a way we would not get caught."
  1945. Question Number 2   Points: 0.00/5.00
  1946. Question Text
  1947. Researchers want to determine the best treatment for high cholesterol: healthy diet, exercise, or medication. Researchers choose 25 patients with high cholesterol to observe. What would be the exploratory variable in this study?
  1948. Your Answer
  1949. C. The participant's weight
  1950. Question Number 3   Points: 0.00/5.00
  1951. Question Text
  1952. A survey asks, "Do you think teenagers are bad drivers? Do you believe teenagers are distracted by the passengers in their car? Would you support a policy increasing the driving age?" What question-wording issue is this an example of?
  1953. Your Answer
  1954. B. Leading Questions
  1955. Question Number 4   Points: 5.00/5.00
  1956. Question Text
  1957. A survey asks the question, "What is your favorite subject in school?" What kind of question is this an example of?
  1958. Your Answer
  1959. A. Open
  1960. Question Number 5   Points: 5.00/5.00
  1961. Question Text
  1962. What is the definition of a variable?
  1963. Your Answer
  1964. C. Something that can be changed
  1965. Question Number 6   Points: 0.00/5.00
  1966. Question Text
  1967. A survey asks, "Do you think teenagers are bad drivers? Do you believe teenagers are distracted by the passengers in their car? Would you support a policy increasing the driving age?" How could this question-wording issue be fixed?
  1968. Your Answer
  1969. C. It could be reworded: "I would not support increasing the driving age unless teenagers were not allowed to drive with passengers."
  1970. Question Number 7   Points: 0.00/5.00
  1971. Question Text
  1972. Researchers want to determine the best treatment for high cholesterol: healthy diet, exercise, or medication. Researchers choose 25 patients with high cholesterol to observe. What would be the lurking variable in this study?
  1973. Your Answer
  1974. B. Whether each participant's cholesterol improved or not improved
  1975. Question Number 8   Points: 0.00/5.00
  1976. Question Text
  1977. A survey asks, "Have you helped someone cheat on their taxes?" What question-wording issue is this an example of?
  1978. Your Answer
  1979. B. Leading Questions
  1980. Question Number 9   Points: 0.00/5.00
  1981. Question Text
  1982. Researchers want to determine the best treatment for high cholesterol: healthy diet, exercise, or medication. Researchers choose 25 patients with high cholesterol to observe. What would be the response variable in this study?
  1983. Your Answer
  1984. A. The method for treating high cholesterol
  1985. Question Number 10  Points: 5.00/5.00
  1986. Question Text
  1987. What is the definition of a response variable?
  1988. Your Answer
  1989. D. The value that they are trying to make a connection to
  1990.  
  1991. Question Number 1   Points: 5.00/5.00
  1992. Question Text
  1993. Find the mean of the data: 14, 9, 2, 13, 16, 3, 13, 10.
  1994. Your Answer
  1995. A. 10
  1996. Question Number 2   Points: 5.00/5.00
  1997. Question Text
  1998. Identify the median of the lower quartile on the box-and-whisker plot.
  1999.  
  2000. Click here for a long description of the image above.
  2001.  
  2002. Your Answer
  2003. B. -3.5
  2004. Question Number 3   Points: 5.00/5.00
  2005. Question Text
  2006. You want to conduct a survey in your neighborhood on people's opinions about the performance of the U.S. Congress this year. There are 100 households in your neighborhood, but you are only able to visit four of them this evening. Which of the following is not a valid random sample?
  2007. Your Answer
  2008. B. {tasty, bitter, neutral, bitter}
  2009. Question Number 4   Points: 0.00/5.00
  2010. Question Text
  2011. There are 7 quarters, 2 dimes, 5 nickels, and 11 pennies to choose from. What is the sample space?
  2012. Your Answer
  2013. D. 25P25
  2014. Question Number 5   Points: 5.00/5.00
  2015. Question Text
  2016. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats: {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the frequency of units with 2 rats?
  2017. Your Answer
  2018. C. 3
  2019. Question Number 6   Points: 0.00/5.00
  2020. Question Text
  2021. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the frequency of units with no rats?
  2022. Your Answer
  2023. B. 2
  2024. Question Number 7   Points: 5.00/5.00
  2025. Question Text
  2026. 100 AAA batteries were tested on a particular MP3 player. Suppose the batteries have a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. If a battery manufacturer wants all batteries to perform closer to the mean, which of the following should he do?
  2027. Your Answer
  2028. B. Improve the manufacturing process so the standard deviation is decreased.
  2029. Question Number 8   Points: 0.00/5.00
  2030. Question Text
  2031. Which of the following are valid random samples when picking an item from a cabinet of food?
  2032. Your Answer
  2033. C. {Salt, hammer, oatmeal, canned soup}
  2034. Question Number 9   Points: 0.00/5.00
  2035. Question Text
  2036. When ordering a pizza, you can choose from 3 crusts, 5 cheeses, 3 meats, and 12 extra toppings. How many different pizzas can be created using only one option from each category?
  2037. Your Answer
  2038. D. 23P23
  2039. Question Number 10  Points: 5.00/5.00
  2040. Question Text
  2041. Find the mean of the data: 7, 3, 10, 8, 4, 1, 8, 6, 5, 8.
  2042. Your Answer
  2043. A. 6
  2044. Question Number 11  Points: 5.00/5.00
  2045. Question Text
  2046. Identify the median of the upper quartile on the box-and-whisker plot.
  2047.  
  2048. Click here for a long description of the image above.
  2049.  
  2050. Your Answer
  2051. C. 9.5
  2052. Question Number 12  Points: 0.00/5.00
  2053. Question Text
  2054. Jessica has taken 6 English tests and scored: 87, 92, 85, 85, 89, and 98. What does she need to make on her next test to have an A, or an average of 90, in the class?
  2055. Your Answer
  2056. D. 100
  2057. Question Number 13  Points: 5.00/5.00
  2058. Question Text
  2059. Find the mean of the data: 206, 194, 198, 172, 190.
  2060. Your Answer
  2061. A. 192
  2062. Question Number 14  Points: 5.00/5.00
  2063. Question Text
  2064. Find the mean of the data: 37, 46, 32, 40, 33, 40, 36, 30.
  2065. Your Answer
  2066. C. 36.75
  2067. Question Number 15  Points: 5.00/5.00
  2068. Question Text
  2069. 100 AAA batteries were tested on a particular MP3 player. Suppose the battery has a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. How long do we expect the majority of batteries to last?
  2070. Your Answer
  2071. D. Between 28.8 and 34.6 hours
  2072. Question Number 16  Points: 5.00/5.00
  2073. Question Text
  2074. Find the range of the data set: 62, 80, 94, 14, 8, 56
  2075. Your Answer
  2076. C. 86
  2077. Question Number 17  Points: 5.00/5.00
  2078. Question Text
  2079. Find the range of the data: 206, 194, 198, 172, 190.
  2080. Your Answer
  2081. D. 34
  2082. Question Number 18  Points: 5.00/5.00
  2083. Question Text
  2084. Find the range of the data: 72, 74, 70, 77, 76, 72
  2085. Your Answer
  2086. C. 7
  2087.  
  2088. Question Number 1   Points: 5.00/5.00
  2089. Question Text
  2090. Identify the range of the data illustrated on the box-and-whisker plot.
  2091.  
  2092. Click here for a long description of the image above.
  2093.  
  2094. Your Answer
  2095. C. 6
  2096. Question Number 2   Points: 0.00/5.00
  2097. Question Text
  2098. The test scores for 9 students on the Unit 1 test were 35, 25, 50, 95, 80, 60, 45, 100, and 90. What is the value of the third quartile for this data set?
  2099. Your Answer
  2100. B. 90
  2101. Question Number 3   Points: 5.00/5.00
  2102. Question Text
  2103. Identify the median on the box-and-whisker plot.
  2104.  
  2105. Click here for a long description of the image above.
  2106.  
  2107. Your Answer
  2108. C. -2
  2109. Question Number 4   Points: 5.00/5.00
  2110. Question Text
  2111. Identify the upper extreme on the box-and-whisker plot.
  2112.  
  2113. Click here for a long description of the image above.
  2114.  
  2115. Your Answer
  2116. C. 1
  2117. Question Number 5   Points: 0.00/5.00
  2118. Question Text
  2119. The test scores for 9 students on the Unit 1 test were 35, 25, 50, 95, 80, 60, 45, 100, and 90. What is the value of the second quartile for this data set?
  2120. Your Answer
  2121. C. 80
  2122. Question Number 1   Points: 5.00/5.00
  2123. Question Text
  2124. Suppose a coin is flipped four times. Which of the following is a valid random sample?
  2125. Your Answer
  2126. D. Three tails and a head
  2127. Question Number 2   Points: 0.00/5.00
  2128. Question Text
  2129. Which of the following are valid random samples when picking an item from a cabinet of food?
  2130. Your Answer
  2131. A. {Salt, sugar, corn flakes, canned soup, tennis racket}
  2132. Question Number 3   Points: 0.00/5.00
  2133. Question Text
  2134. Jessica weighed herself every day. The following graph shows her weight distribution over a number of days. How many days in total did she weigh 138 or less?
  2135.  
  2136. Question Number 1   Points: 5.00/5.00
  2137. Question Text
  2138. Find the range of the data set: 18, 51, 23, 9, 62, 23, 24
  2139. Your Answer
  2140. C. 53
  2141. Question Number 2   Points: 5.00/5.00
  2142. Question Text
  2143. A spark plug is guaranteed to last 50,000 miles, with a standard deviation of 1,500 miles. If this spark plug becomes defective at 49,000 miles, is it still under warranty?
  2144. Your Answer
  2145. A. Yes
  2146. Question Number 3   Points: 5.00/5.00
  2147. Question Text
  2148. A brand of light bulb is rated to last 2,250 hours, with a standard deviation of 300 hours. Suppose a particular light bulb of this brand burned out at 1,970 hours. Which of the following is the correct way to describe the performance of this bulb?
  2149. Your Answer
  2150. B. It performed as expected.
  2151. Question Number 4   Points: 0.00/5.00
  2152. Question Text
  2153. A courier company claims in its advertisement that it can get all packages from city A to city B in exactly 12 hours; no more, no less. Which of the following does NOT represent the company's claim?
  2154. Your Answer
  2155. A. The range of delivery times is zero
  2156. Question Number 5   Points: 5.00/5.00
  2157. Question Text
  2158. 100 AAA batteries were tested on a particular MP3 player. Suppose the batteries have a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. If a battery manufacturer wants all batteries to perform closer to the mean, which of the following should he do?
  2159. Your Answer
  2160. B. Improve the manufacturing process so the standard deviation is decreased.
  2161. Question Number 6   Points: 5.00/5.00
  2162. Question Text
  2163. Find the range of the data set: 10, 18, 21, 28, 12, 20
  2164. Your Answer
  2165. C. 18
  2166. Question Number 7   Points: 5.00/5.00
  2167. Question Text
  2168. Find the range of the data set: 3, 17, 19, 30, 22, 13
  2169. Your Answer
  2170. C. 27
  2171. Question Number 8   Points: 0.00/5.00
  2172. Question Text
  2173. Deaths due to malaria in a certain African country were estimated to be 811 in 2008, with a standard deviation of 44. If you want to see if the conditions have improved in 2011, which of the following would you looking for in the 2011 report?
  2174. Your Answer
  2175. C. A decrease in the range
  2176. Question Number 9   Points: 5.00/5.00
  2177. Question Text
  2178. Find the range of the data set: -15, 11, 12, -10, 12, -4
  2179. Your Answer
  2180. D. 27
  2181. Question Number 10  Points: 5.00/5.00
  2182. Question Text
  2183. Find the range of the data set: 1, 20, 13, 33, 24, 22
  2184. Your Answer
  2185. B. 32
  2186. Your Answer
  2187. D. 21
  2188. Question Number 4   Points: 0.00/5.00
  2189. Question Text
  2190. There are an estimated 12,000 houses in a certain city. The city wanted to find out what percentage of houses have more than 1 floor. It did a survey of 400 households and found that 160 of them have more than 1 floor. What is the population size of this study?
  2191. Your Answer
  2192. C. 400
  2193. Question Number 5   Points: 5.00/5.00
  2194. Question Text
  2195. There are 75 people entering a drawing. Determine the sample space for 5 people being chosen at random as prize winners.
  2196. Your Answer
  2197. C. 75C5
  2198. Question Number 6   Points: 0.00/5.00
  2199. Question Text
  2200. There are 250 students in the junior class. 50 of them will be selected at random to participate in a survey. Determine the sample space for the students being chosen.
  2201. Your Answer
  2202. A. 250P50
  2203. Question Number 7   Points: 0.00/5.00
  2204. Question Text
  2205. Jessica weighed herself every day. The following graph shows her weight distribution over a number of days. How many days in total did she weigh herself?
  2206.  
  2207. Your Answer
  2208. B. 9
  2209. Question Number 8   Points: 5.00/5.00
  2210. Question Text
  2211. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the relative frequency of units with 3 rats?
  2212. Your Answer
  2213. D. 0.22
  2214. Question Number 9   Points: 5.00/5.00
  2215. Question Text
  2216. You want to conduct a survey in your neighborhood on people's opinions about the performance of the U.S. Congress this year. There are 100 households in your neighborhood, but you are only able to visit four of them this evening. Which of the following is not a valid random sample?
  2217. Your Answer
  2218. B. {tasty, bitter, neutral, bitter}
  2219. Question Number 10  Points: 0.00/5.00
  2220. Question Text
  2221. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats {2, 5, 3, 1, 0, 3, 7, 2, 2}. If the sample data is representative of the rat population, how many units in the entire apartment complex have 3 rats?
  2222. Your Answer
  2223. C. 17
  2224. Question Number 11  Points: 0.00/5.00
  2225. Question Text
  2226. There are 9 blue marbles, 4 green marbles, 6 white marbles, 1 red marble, and 8 yellow marbles to choose from. What is the sample space?
  2227. Your Answer
  2228. B. 28C28
  2229. Question Number 12  Points: 0.00/5.00
  2230. Question Text
  2231. There are 25 players on a lacrosse team. Determine the sample space for choosing players for the 10 starting positions.
  2232. Your Answer
  2233. B. 25C10
  2234. Question Number 1   Points: 1.00/1.00
  2235. Question Text
  2236. In deciding whether to pay for a high or low deductible auto insurance policy, which of the following is NOT a factor in the decision process?
  2237. Your Answer
  2238. B.
  2239. Which policy most of the client's friends bought
  2240.  
  2241. Question Number 2   Points: 0.00/1.00
  2242. Question Text
  2243. Determine the probability of drawing a 1 from a regular deck of cards.
  2244. Your Answer
  2245. A. 1/13
  2246. Question Number 3   Points: 1.00/1.00
  2247. Question Text
  2248. What is the total area to the right of the mean under a normal distribution curve?
  2249.  
  2250. Your Answer
  2251. C. 0.5
  2252. Question Number 4   Points: 0.00/1.00
  2253. Question Text
  2254. The formula associated with a binomial model is .
  2255. Click here for a long description of the image above.
  2256.  
  2257. What does the "x" in the formula represent?
  2258. Your Answer
  2259. B. number of trials
  2260. Question Number 5   Points: 1.00/1.00
  2261. Question Text
  2262. What is the approximate conditional probability of someone being female, given a preference for two-lane highways with traffic lights?
  2263. Your Answer
  2264. C. 0.46
  2265. Question Number 6   Points: 0.00/1.00
  2266. Question Text
  2267. Which of the following graphs is a valid probability distribution of a random variable over a week?
  2268. Your Answer
  2269. D.
  2270. Question Number 7   Points: 1.00/1.00
  2271. Question Text
  2272. A researcher wants to conduct a genetic study using 15 randomly-selected volunteers. He has a volunteer pool of 30, composed of 15 males and 15 females. What is the probability that the randomly-selected group will be all male OR all female?
  2273. Your Answer
  2274. B. 1/77,558,760
  2275. Question Number 8   Points: 0.00/1.00
  2276. Question Text
  2277. What is the quadratic regression equation for the points (4, 75), (6, 14), (7, 22), and (9, 120)?
  2278. Your Answer
  2279. C. y = 25.96x^2 - 125.43x + 682.73
  2280. Question Number 9   Points: 0.00/1.00
  2281. Question Text
  2282. Let the random variable A represent the outcome of a dice roll. Which of the following bar graphs correctly represent the probability distribution of A?
  2283. Your Answer
  2284. B.
  2285. Question Number 10  Points: 1.00/1.00
  2286. Question Text
  2287. Describe the following scatterplot.
  2288.  
  2289. Your Answer
  2290. B. negative correlation
  2291. Question Number 11  Points: 1.00/1.00
  2292. Question Text
  2293. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula P(x) = {n! / [x! (n-x)!]} * p^x * q^(n-x) to determine the probability of how many games they will win. How many of the next 15 games should you expect the Rangers to win?
  2294.  
  2295. Your Answer
  2296. D. 8
  2297. Question Number 12  Points: 1.00/1.00
  2298. Question Text
  2299. Scott plays video games every day after school. It seems like the more he plays, the better his scores get. (Practice makes perfect, right?) The scatter plot below compares Scott’s high scores to the amount of time he’s played. What is the slope of the line of best fit?
  2300.  
  2301.  
  2302. Your Answer
  2303. C. 1/4
  2304. Question Number 13  Points: 0.00/1.00
  2305. Question Text
  2306. To win a lottery, a person must pick five numbers from 1 to 50 in any order AND a MEGA number from 1 to 30 on the play slip. Determine the probability for winning the jackpot.
  2307. Your Answer
  2308. B. 1/7,627,536,000
  2309. Question Number 14  Points: 0.00/1.00
  2310. Question Text
  2311. There are 9 music students, 2 music professors, and 5 computer science students sitting in a waiting room. If a professor leaves the room, what is the conditional probability that the person is a musician?
  2312. Your Answer
  2313. C. 9/14
  2314. Question Number 15  Points: 0.00/1.00
  2315. Question Text
  2316. The parents of a child who participates in full-contact sports are trying to decide if they should purchase a sports insurance policy for their child. Which of the following is NOT a factor in their decision process?
  2317.  
  2318. Your Answer
  2319. C.
  2320. Historical frequency of injuries of their child
  2321.  
  2322. Question Number 16  Points: 1.00/1.00
  2323. Question Text
  2324. MacArthur High School created a scatter plot to illustrate the number of graduates it has produced over the past several years. Which of the following scatter plots has the most appropriate line of best fit?
  2325. Your Answer
  2326. D.
  2327. Question Number 17  Points: 0.00/1.00
  2328. Question Text
  2329. You purchase a lottery ticket for $2 from a grocery store. There are a total of 100,000 tickets in circulation. The grand prize is $10,000. What are your expected winnings?
  2330. Your Answer
  2331. B. $1.00
  2332. Question Number 18  Points: 0.00/1.00
  2333. Question Text
  2334. You conduct an experiment where you roll a die and record the results. You roll the die 1230 times and the results are shown in the table below:
  2335.  
  2336. Result
  2337.  
  2338. Frequency
  2339.  
  2340. 1
  2341.  
  2342. 245
  2343.  
  2344. 2
  2345.  
  2346. 172
  2347.  
  2348. 3
  2349.  
  2350. 219
  2351.  
  2352. 4
  2353.  
  2354. 201
  2355.  
  2356. 5
  2357.  
  2358. 137
  2359.  
  2360. 6
  2361.  
  2362. 256
  2363.  
  2364.  
  2365. In which result was the experimental probability the closest to the theoretical probability?
  2366. Your Answer
  2367. D. Roll of 6
  2368. Question Number 19  Points: 0.00/1.00
  2369. Question Text
  2370. What is the significance of a correlation coefficient of 0.16?
  2371. Your Answer
  2372. C. The points do not follow the line of fit and the line is decreasing.
  2373. Question Number 20  Points: 0.00/1.00
  2374. Question Text
  2375. You are doing an experiment for the Science Fair. You set up a booth at lunch that has a spinner with three equal parts (red, green, blue). You determine the probabilities of landing on each color and then have anyone who is interested spin the spinner and you record the results. After 500 spins, you are surprised to find that 82% of the spins that start in the green sector end up in the blue sector. Based on your research you begin to predict the outcomes. When your fellow students begin gambling on the outcomes, the principal shuts down your booth and you receive 3 days of in-school suspension.
  2376.  
  2377. Which part of this story involves theoretical probability?
  2378. Your Answer
  2379. B. After 500 spins, you are surprised to find that 82% of the spins that start in the green sector end up in the blue sector.
  2380. Question Number 21  Points: 1.00/1.00
  2381. Question Text
  2382. A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of customer purchase for the models are as follows:
  2383. x   13.5    15.9    19.1
  2384. P(x)    0.2 0.5 0.3 Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 0.4 cubic feet smaller. What is the standard deviation in the actual size of the freezers purchased by all customers?
  2385. Your Answer
  2386. B. 2.0
  2387. Question Number 22  Points: 1.00/1.00
  2388. Question Text
  2389. Which linear equation would be the best fit for the following scatter plot?
  2390.  
  2391. Your Answer
  2392. D. y = (4/5)x - 8
  2393. Question Number 23  Points: 1.00/1.00
  2394. Question Text
  2395. Jackson earns commission according to how much he sells. Since he is a fast learner, he is becoming a better and better salesman by the month. The scatter plot below shows how much commission Jackson has earned over the past twelve months. Approximately how much do you predict Jackson will make in commission during the month of December?
  2396.  
  2397.  
  2398. Your Answer
  2399. C. $3,400
  2400. Question Number 24  Points: 1.00/1.00
  2401. Question Text
  2402. What is the total area under a normal distribution curve?
  2403. Your Answer
  2404. D. 1
  2405. Question Number 25  Points: 0.00/1.00
  2406. Question Text
  2407. What is the value of c in the quadratic regression equation for these points: (-3, 1.2), (1, 0.4), (5, 1.6), (11, 2.6)?
  2408. Your Answer
  2409. C. 0.83
  2410. Question Number 26  Points: 0.00/1.00
  2411. Question Text
  2412.  
  2413. Which of these pairs of variables would you expect to be
  2414. represented by a scatterplot with a negative correlation?
  2415. Your Answer
  2416. A. The weight of a package and the cost to mail the package.
  2417. Question Number 27  Points: 0.00/1.00
  2418. Question Text
  2419. Question
  2420. Lemon = 15, orange = 15, cola = 10, and grape = 10
  2421. There are 50 cans of soda in a cooler. The table shows the
  2422. number of each kind of soda. Two cans of soda are taken from
  2423. the cooler at random. What is the probability that both cans are
  2424. Lemon?
  2425. Your Answer
  2426. B. 9 100
  2427. Question Number 28  Points: 0.00/1.00
  2428. Question Text
  2429.  
  2430.  
  2431. Allen collects rare coins. He has prepared this scatterplot to
  2432. compare the number of each type of coin that was produced
  2433. with the value of the coin to collectors. What conclusion can you
  2434. draw from this scatterplot?
  2435. Your Answer
  2436. B. The more valuable the coin, the more coins there are.
  2437. Question Number 29  Points: 1.00/1.00
  2438. Question Text
  2439. Let X represent the outcome of a single roll of a fair die. Suppose you win $1 if the outcome is either 2 or 5, and lose no money if the outcome is otherwise.  "What can you expect to win after tossing the die 20 times?"
  2440. Your Answer
  2441. C. $6.67
  2442. Question Number 30  Points: 0.00/1.00
  2443. Question Text
  2444. Find the exponential regression equation for the data points (-4, 0.75), (-2, 6), (3, 28), and (5, 162).
  2445. Your Answer
  2446. A. y = 8.43(1.69)^x
  2447. Question Number 31  Points: 1.00/1.00
  2448. Question Text
  2449. A sample set contains the following data: {2.5, 4.1, 6, 8, 9, 9, 9.5, 10}. Approximately where is the mean value located?
  2450.  
  2451. Your Answer
  2452. B.
  2453. Closer to 10 than 2.5
  2454.  
  2455. Question Number 32  Points: 1.00/1.00
  2456. Question Text
  2457. A biologist is researching a newly-discovered species of bacteria. He puts 200 bacteria into what he has determined to be a favorable growth medium. Nine hours later, he measures 380 bacteria. Assuming exponential growth, find the growth equation and use it to determine the number of bacteria after eight hours.
  2458. Your Answer
  2459. B. 354
  2460. Question Number 33  Points: 0.00/1.00
  2461. Question Text
  2462. A sample set contains the following data: {2.5, 4.1, 6, 8, 9, 9, 9.5, 10}. What is the shape of its probability distribution curve?
  2463.  
  2464. Your Answer
  2465. B.
  2466. Positively skewed
  2467.  
  2468. Question Number 34  Points: 1.00/1.00
  2469. Question Text
  2470. A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of customer purchase for the models are as follows:
  2471. x   13.5    15.9    19.1
  2472. P(x)    0.2 0.5 0.3 Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 0.4 cubic feet smaller. What is the mean actual size of the freezers purchased by all customers?
  2473. Your Answer
  2474. B. 16.0
  2475. Question Number 35  Points: 0.00/1.00
  2476. Question Text
  2477. Find the exponential regression equation for the data points (-3, 8), (0, 5), (2, 4), and (5, 3).
  2478. Your Answer
  2479. D. y = 5.53(1.08)^x
  2480. Question Number 36  Points: 0.00/1.00
  2481. Question Text
  2482. About 5% of a certain type of wall nails made by a hardware supplier exceeds the requirement of being able to support 500 pounds of weight. The supplier decides to remove these nails and sell them as premium wall nails. What will happen to the standard deviation of the weight the regular nails can support?
  2483.  
  2484. Your Answer
  2485. A.
  2486. It will increase.
  2487.  
  2488. Question Number 37  Points: 1.00/1.00
  2489. Question Text
  2490. When playing a game, the winner must roll a number less than 3 or more than 4. What type of events are these?
  2491. Your Answer
  2492. C. Mutually exclusive
  2493. Question Number 38  Points: 1.00/1.00
  2494. Question Text
  2495. What is the quadratic regression equation for the points (-3, 1.2), (1, 0.4), (5, 1.6), (11, 2.6)?
  2496. Your Answer
  2497. B. y = 0.016x^2 - 0.01x + 0.86
  2498. Question Number 39  Points: 0.00/1.00
  2499. Question Text
  2500. What is the value of b in the quadratic regression equation for these points: (2, 5), (4, 11), (5, 41), and (9, -2)?
  2501. Your Answer
  2502. C. 15.62
  2503. Question Number 40  Points: 0.00/1.00
  2504. Question Text
  2505. A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 56.8 grams of radioactive substance. 12 days later, there are 55.45 grams. After 25 days, there are 54.03 grams. After 41 days, there are 52.32 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days and use the equation to determine the amount of radioactive material remaining after 500 days.
  2506. Your Answer
  2507. B. 2.25 g
  2508. Question Number 41  Points: 0.00/1.00
  2509. Question Text
  2510. What does it mean if a is negative in the quadratic regression equation?
  2511. Your Answer
  2512. D. The vertex of the parabola is to the left of the y-axis.
  2513. Question Number 42  Points: 0.00/1.00
  2514. Question Text
  2515. Which type of question fits a binomial model?
  2516. Your Answer
  2517. C. multiple choice
  2518. Question Number 43  Points: 0.00/1.00
  2519. Question Text
  2520. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula
  2521. Click here for a long description of the image above.
  2522.  
  2523.  
  2524. to determine the probability that they will win 4 of their next 5 games. What value will be substituted for "q" in the formula?
  2525. Your Answer
  2526. C. 35
  2527. Question Number 44  Points: 0.00/1.00
  2528. Question Text
  2529. Suppose a randomly-picked number is 11. Where is this number located in the Venn diagram below?
  2530. Your Answer
  2531. A. Inside the circle on the left, excluding the intersection
  2532. Question Number 45  Points: 0.00/1.00
  2533. Question Text
  2534. Which of the following does the entire area enclosed by the two ovals (including the intersection) in the Venn diagram below represent?
  2535.  
  2536. Your Answer
  2537. C. An event that is both A and B
  2538. Question Number 46  Points: 0.00/1.00
  2539. Question Text
  2540. There are 20 players on a hockey team. 5 of them are rookies. Determine the probability that none of the rookies will be randomly selected to be included in the team's group of 6 starters.
  2541. Your Answer
  2542. C. 1 38,760
  2543. Question Number 47  Points: 1.00/1.00
  2544. Question Text
  2545. Which of the following does the entire area outside the two ovals in the Venn diagram below represent?
  2546.  
  2547. Your Answer
  2548. A. An event that is neither A nor B
  2549. Question Number 48  Points: 1.00/1.00
  2550. Question Text
  2551. The life expectancy of a certain tire is a normal distribution with the mean = 40,000 miles, standard deviation is 1,000 miles. Find the probability that a tire will last more than 40,000 miles.
  2552. Your Answer
  2553. A. 50%
  2554. Question Number 49  Points: 1.00/1.00
  2555. Question Text
  2556. Determine the probability of drawing an ace from a regular deck of cards.
  2557. Your Answer
  2558. A. 1/13
  2559. Question Number 50  Points: 0.00/1.00
  2560. Question Text
  2561. A manufacturer makes ceramic heaters that have a life expectancy of 10 years.  Two percent of the heaters are defective because they break down after the first month. If the manufacturing process is improved so that the number of defective units drops to 1%, how will the standard deviation of the heaters change?
  2562.  
  2563. Your Answer
  2564. B.
  2565. It will not change at all.
  2566.  
  2567. Question Number 51  Points: 0.00/1.00
  2568. Question Text
  2569.  
  2570. Which of these pairs of variables would you expect to be
  2571. represented by a scatterplot with a positive correlation?
  2572. Your Answer
  2573. B. The number of miles driven and the number of people on the
  2574. bus.
  2575. Question Number 52  Points: 1.00/1.00
  2576. Question Text
  2577. What percentage of people who prefer to drive on multi-lane highways with traffic lights are male?
  2578. Your Answer
  2579. C. 56%
  2580. Question Number 53  Points: 1.00/1.00
  2581. Question Text
  2582. An appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of a customer purchase for the models are as follows:
  2583. x   13.5    15.9    19.1
  2584. P(x)    0.2 0.5 0.3
  2585. What is the mean size of the freezers purchased by all customers?
  2586. Your Answer
  2587. C. 16.38
  2588. Question Number 54  Points: 1.00/1.00
  2589. Question Text
  2590. Question
  2591. Marco is taking a multiple-choice test. There are 5 choices for each question. Marco does not know how to answer one of the questions. If he guesses, what is the probability that he will guess the correct answer?
  2592. Your Answer
  2593. B. 0.20
  2594. Question Number 55  Points: 0.00/1.00
  2595. Question Text
  2596. A bag contains 5 blue and 3 green marbles. Marbles are drawn at random without replacement. Which of the following gives the probability of drawing a green marble on both your first and second draw?
  2597. Your Answer
  2598. D. (5/8)(3/7)
  2599. Question Number 56  Points: 1.00/1.00
  2600. Question Text
  2601. A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 6.2 grams of radioactive substance. 12 days later, there are 6.16 grams. After 19 days, there are 6.13 grams. After 46 days, there are 5.92 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days.
  2602. Your Answer
  2603. C. y = 6.23(0.999)x
  2604. Question Number 57  Points: 0.00/1.00
  2605. Question Text
  2606. After 75 games of the 2009 baseball season, the Texas Rangers had a record of 40 wins and 35 losses for a winning percentage of .533. You realize that this data fits a binomial model and want to use the formula P(x) = {n! / [x! (n-x)!]} * p^x * q^(n-x) to determine the probability of how many games they will win. What is the expected number of games the Rangers will win in the next 5 games?
  2607.  
  2608. Your Answer
  2609. C. 2.33
  2610. Question Number 58  Points: 0.00/1.00
  2611. Question Text
  2612. There are 15 players on a football team. 3 are related to each other. Determine the probability of choosing none of the relatives to be one of the 11 starters in the game.
  2613. Your Answer
  2614. B. 1 1,365
  2615. Question Number 59  Points: 0.00/1.00
  2616. Question Text
  2617.  
  2618.  
  2619. This scatterplot compares the amount of money earned at the
  2620. fundraiser with the number of raffle tickets sold. What
  2621. conclusion can you draw from this scatterplot?
  2622. Your Answer
  2623. B. The amount of money raised increases as the number of tickets
  2624. sold decreases.
  2625. Question Number 60  Points: 1.00/1.00
  2626. Question Text
  2627. The following two sets of measurements are for the weight of the same object in grams:
  2628.  
  2629. {2.0, 1.9, 2.1, 1.8, 2.0} {1.9, 1.8, 2.0, 2.1, 2.0} Which of these two sets of measurements is more reliable?
  2630. Your Answer
  2631. C.
  2632. Both sets are equally reliable.
  2633. Question Number 1   Points: 0.00/1.00
  2634. Question Text
  2635. A researcher wants to determine the best method for teaching college students: traditional campus classes or online classes. The researcher chooses to observe the final exam grades of fifty college students enrolled in both types of courses. What would be the response variable in this study?
  2636. Your Answer
  2637. C. The participant's learning style
  2638. Question Number 2   Points: 1.00/1.00
  2639. Question Text
  2640. What is the mean of the following data set?
  2641. {15, 93, 72, 32, 64}
  2642. Your Answer
  2643. B. 55.2
  2644. Question Number 3   Points: 1.00/1.00
  2645. Question Text
  2646. You are making a line graph for the price of gasoline on the first day of the last five months. The data is shown in the following table:
  2647.  
  2648. January 1
  2649.  
  2650. February 1
  2651.  
  2652. March 1
  2653.  
  2654. April 1
  2655.  
  2656. May 1
  2657.  
  2658. $2.05
  2659.  
  2660. $2.12
  2661.  
  2662. $2.53
  2663.  
  2664. $2.10
  2665.  
  2666. $2.45
  2667.  
  2668.  
  2669. Which of the following is not an ordered pair you would use to make the graph?
  2670. Your Answer
  2671. A. (0, $2.05)
  2672. Question Number 4   Points: 1.00/1.00
  2673. Question Text
  2674. You collected the following data about the color of dresses at the prom:
  2675.  
  2676. Red
  2677.  
  2678. Black
  2679.  
  2680. Blue
  2681.  
  2682. White
  2683.  
  2684. Other
  2685.  
  2686. 14
  2687.  
  2688. 37
  2689.  
  2690. 22
  2691.  
  2692. 56
  2693.  
  2694. 33
  2695.  
  2696.  
  2697. When making a pie chart for this data, what percentage of the circle would the sector labeled "Black" take up? Round your answer to the nearest whole percent.
  2698. Your Answer
  2699. B. 23%
  2700. Question Number 5   Points: 1.00/1.00
  2701. Question Text
  2702. Find the range of the data set: 4, 16, 23, 32, 11, 12
  2703. Your Answer
  2704. B. 28
  2705. Question Number 6   Points: 0.00/1.00
  2706. Question Text
  2707. When ordering a pizza, you can choose from 3 crusts, 5 cheeses, 3 meats, and 12 extra toppings. How many different pizzas can be created using only one option from each category?
  2708. Your Answer
  2709. N/A
  2710. Question Number 7   Points: 1.00/1.00
  2711. Question Text
  2712. What is the mean of the following data set?
  2713. {72, 67, 42, 95, 83, 70, 55, 93, 77}
  2714. Your Answer
  2715. A. 72.67
  2716. Question Number 8   Points: 1.00/1.00
  2717. Question Text
  2718. According to the bar graph, how many countries will have a population in excess of 40 million in 2050?
  2719.  
  2720.  
  2721. Click here for a long description of the image above.
  2722.  
  2723. Your Answer
  2724. C. 3
  2725. Question Number 9   Points: 1.00/1.00
  2726. Question Text
  2727. To determine the effectiveness of a classroom management program, teachers watch and record changes in student behavior that occur in response to this methodology. What type of study design is this?
  2728. Your Answer
  2729. B. Observational Study
  2730. Question Number 10  Points: 1.00/1.00
  2731. Question Text
  2732. The following graph shows wins per season for the Texas Rangers for the years 2000 - 2008.
  2733.  
  2734. Click here for a long description of the image above.
  2735.  
  2736. In which year did the Rangers' wins increase from the previous year?
  2737. Your Answer
  2738. D. 2006
  2739. Question Number 11  Points: 1.00/1.00
  2740. Question Text
  2741. Question
  2742. Find the median of the given set of data.  Shoe sizes of a class of twenty students.
  2743. 6, 9, 10, 8.5, 9.5, 11, 13, 10, 7, 9, 7.5, 10, 9, 14, 12, 10, 7, 9, 10, 11
  2744. Your Answer
  2745. C. 9.75
  2746. Question Number 12  Points: 0.00/1.00
  2747. Question Text
  2748. A researcher wants to determine the best method for teaching college students: traditional campus classes or online classes. The researcher chooses to observe the final exam grades of fifty college students enrolled in both types of courses. What would be the exploratory variable in this study?
  2749. Your Answer
  2750. N/A
  2751. Question Number 13  Points: 0.00/1.00
  2752. Question Text
  2753. You have 3 pairs of pants, 7 shirts, and 5 hats to make an outfit with. How many different outfits can be created?
  2754. Your Answer
  2755. N/A
  2756. Question Number 14  Points: 0.00/1.00
  2757. Question Text
  2758. A survey question is worded as, "Congressmen make at least $100,000 more than the average American. Do you think congressmen make enough money?" What question-wording issue is this an example of?
  2759. Your Answer
  2760. N/A
  2761. Question Number 15  Points: 1.00/1.00
  2762. Question Text
  2763. The following graph shows wins per season for the Texas Rangers for the years 2000 - 2008.
  2764.  
  2765. Click here for a long description of the image above.
  2766.  
  2767. In what year did the Rangers win total decrease for the second consecutive year?
  2768. Your Answer
  2769. C. 2003
  2770. Question Number 16  Points: 0.00/1.00
  2771. Question Text
  2772. A student survey is issued to determine how helpful a study guide was, asking students to choose one of the following: 1) extremely helpful 2) very helpful 3) helpful 4) not helpful. What question-wording issue is this an example of?
  2773. Your Answer
  2774. N/A
  2775. Question Number 17  Points: 1.00/1.00
  2776. Question Text
  2777. A student survey asks how helpful a study guide was by choosing one from the following: 1) extremely helpful 2) very helpful 3) helpful 4) not helpful. Is this an example of open or closed questioning?
  2778. Your Answer
  2779. B. Closed
  2780. Question Number 18  Points: 1.00/1.00
  2781. Question Text
  2782. Which of the following values is included in the data set illustrated by this stem-and-leaf plot?
  2783.  
  2784. Click here for a long description of the image above.
  2785.  
  2786. Your Answer
  2787. C. 44
  2788. Question Number 19  Points: 0.00/1.00
  2789. Question Text
  2790. You wish to plot the data value 556 in a stem-and-leaf plot. What is the stem of 556?
  2791. Your Answer
  2792. A. 5
  2793. Question Number 20  Points: 1.00/1.00
  2794. Question Text
  2795. If you needed to plot the data shown in the stem-and-leaf plot below using a different graph type, what would be the best choice?
  2796.  
  2797. Click here for a long description of the image above.
  2798.  
  2799. Your Answer
  2800. A. Bar graph or pictogram; there are only a few data values, and a bar graph or pictogram will make a more impressive display.
  2801. Question Number 21  Points: 0.00/1.00
  2802. Question Text
  2803. You want to conduct a survey in your neighborhood on people's opinions about the performance of the U.S. Congress this year. There are 100 households in your neighborhood, but you are only able to visit four of them this evening. Which of the following is not a valid random sample?
  2804. Your Answer
  2805. N/A
  2806. Question Number 22  Points: 0.00/1.00
  2807. Question Text
  2808. Your friend has a quarter (Q), a dime (D) and a nickel (N). He keeps each coin hidden under a small styrofoam cup so you do not know the location of the coin. You randomly pick two coins out of the three by lifting two cups. Which of the following is a valid sample space?
  2809. Your Answer
  2810. N/A
  2811. Question Number 23  Points: 1.00/1.00
  2812. Question Text
  2813. What is the definition of a lurking variable?
  2814. Your Answer
  2815. B. Something that may affect the results of a study that has not been included in the design
  2816. Question Number 24  Points: 1.00/1.00
  2817. Question Text
  2818. According to the bar graph, how many countries can expect to lose population from 2000 to 2050?
  2819.  
  2820.  
  2821. Click here for a long description of the image above.
  2822.  
  2823. Your Answer
  2824. B. 2
  2825. Question Number 25  Points: 0.00/1.00
  2826. Question Text
  2827. You wish to plot the data value 168 in a stem-and-leaf plot. What is the stem of 168?
  2828. Your Answer
  2829. A. 1
  2830. Question Number 26  Points: 0.00/1.00
  2831. Question Text
  2832. There are an estimated 12,000 houses in a certain city. The city wanted to find out what percentage of houses have more than 1 floor. It did a survey of 400 households and found that 160 of them have more than 1 floor. Based on these results, how many houses in the city can be inferred to have more than 1 floor?
  2833. Your Answer
  2834. N/A
  2835. Question Number 27  Points: 1.00/1.00
  2836. Question Text
  2837. Which of the following data sets is illustrated by this stem-and-leaf plot?
  2838.  
  2839. Click here for a long description of the image above.
  2840.  
  2841. Your Answer
  2842. B. 25, 26, 27, 53, 58, 62, 67, 69, 96, 96, 123
  2843. Question Number 28  Points: 0.00/1.00
  2844. Question Text
  2845. A student survey is issued to determine how helpful a study guide was, asking students to choose one of the following: 1) extremely helpful 2) very helpful 3) helpful 4) not helpful. How could this question-wording issue be fixed?
  2846. Your Answer
  2847. N/A
  2848. Question Number 29  Points: 1.00/1.00
  2849. Question Text
  2850. According to the bar graph, which country has the largest population size in 2050?
  2851.  
  2852.  
  2853. Click here for a long description of the image above.
  2854.  
  2855. Your Answer
  2856. C. Egypt
  2857. Question Number 30  Points: 0.00/1.00
  2858. Question Text
  2859. Doctors want to determine the best medication for Alzheimer's, medication A or medication B. They randomly choose participants to be given one of the unmarked medications. Neither the participants nor the researchers are aware of which medication was given to which of the participants. Identify the type of experiment described.
  2860. Your Answer
  2861. N/A
  2862. Question Number 31  Points: 1.00/1.00
  2863. Question Text
  2864. 100 AAA batteries were tested on a particular MP3 player. Suppose the battery has a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. How long do we expect the majority of batteries to last?
  2865. Your Answer
  2866. D. Between 28.8 and 34.6 hours
  2867. Question Number 32  Points: 0.00/1.00
  2868. Question Text
  2869. A study of college tuition costs is being conducted. The names of 15 students currently enrolled have been selected from each college. What type of sampling is this using?
  2870. Your Answer
  2871. N/A
  2872. Question Number 33  Points: 0.00/1.00
  2873. Question Text
  2874. The city transit bus is supposed to arrive at a bus stop at 15 minutes past the hour every hour. The arrival time has a standard deviation of 4 minutes. If the bus company wants the arrival time to be more consistent, which of the following should be done?
  2875. Your Answer
  2876. A. Increase the standard deviation of the arrival time
  2877. Question Number 34  Points: 1.00/1.00
  2878. Question Text
  2879. Which bar chart accurately reflects the data in the table below?
  2880.  
  2881.  
  2882. Miles Driven
  2883.  
  2884. Bill
  2885.  
  2886. Sue
  2887.  
  2888. Mary
  2889.  
  2890. Cristina
  2891.  
  2892. Year 1
  2893.  
  2894. 500
  2895.  
  2896. 875
  2897.  
  2898. 1000
  2899.  
  2900. 650
  2901.  
  2902. Year 2
  2903.  
  2904. 700
  2905.  
  2906. 950
  2907.  
  2908. 1200
  2909.  
  2910. 500
  2911.  
  2912.  
  2913. Your Answer
  2914. B.
  2915. Question Number 35  Points: 0.00/1.00
  2916. Question Text
  2917. There are 7 quarters, 2 dimes, 5 nickels, and 11 pennies to choose from. What is the sample space?
  2918. Your Answer
  2919. C. 25C25
  2920. Question Number 36  Points: 1.00/1.00
  2921. Question Text
  2922. The pie chart below shows the results of a survey of 120 people.
  2923. Circle chart with 4 sectors:  Republican 36 %, Democrat 31 percent, Independent 18 %, and not registered 15 %.
  2924. How many people in the survey are registered as Republicans? Be sure to round decimal answers to the nearest whole number.
  2925. Your Answer
  2926. D. 43
  2927. Question Number 37  Points: 0.00/1.00
  2928. Question Text
  2929. Suppose that you would like to study the occurrence of obesity in high schools in your state. You survey only the students in your math class at your high school. What type of sampling is this using?
  2930. Your Answer
  2931. B. Self-Selected Sampling
  2932. Question Number 38  Points: 0.00/1.00
  2933. Question Text
  2934. There are 15 players on a hockey team. Determine the sample space for choosing players for the 6 starting positions.
  2935. Your Answer
  2936. C. 15C6
  2937. Question Number 39  Points: 1.00/1.00
  2938. Question Text
  2939. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats: {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the frequency of units with 2 rats?
  2940. Your Answer
  2941. C. 3
  2942. Question Number 40  Points: 1.00/1.00
  2943. Question Text
  2944. The pie chart below shows the results of a survey of 120 people.
  2945. Circle chart with 4 sectors:  Republican 36 %, Democrat 31 percent, Independent 18 %, and not registered 15 %.
  2946. How many people in the survey are not registered to vote? Be sure to round decimal answers to the nearest whole number.
  2947. Your Answer
  2948. B. 18
  2949. Question Number 41  Points: 0.00/1.00
  2950. Question Text
  2951. A study of college tuition costs is being conducted. The college students surveyed all attend the same college as the person performing the study. What type of sampling is this using?
  2952. Your Answer
  2953. D. Cluster Sampling
  2954. Question Number 42  Points: 1.00/1.00
  2955. Question Text
  2956. Pie chart of sporting goods sales with six sectors:  shoes 52 %, socks 9 %, shirts 11 %, shorts 17 %, headbands 5 %, and jogging suits 6 %.  
  2957. According to the circle graph, what percent of sales came from items other than shoes and socks?
  2958. Your Answer
  2959. B. 39%
  2960. Question Number 43  Points: 0.00/1.00
  2961. Question Text
  2962. Suppose that you would like to study the occurrence of obesity in high schools in your state. Twenty students are selected at random from each high school in the state to be surveyed. What type of sampling is this using?
  2963. Your Answer
  2964. A. Opportunity Sampling
  2965. Question Number 44  Points: 0.00/1.00
  2966. Question Text
  2967. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the relative frequency of units with no rats?
  2968. Your Answer
  2969. C. 0.16
  2970. Question Number 45  Points: 0.00/1.00
  2971. Question Text
  2972. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats {2, 5, 3, 1, 0, 3, 7, 2, 2}. If the sample data is representative of the rat population, how many units in the entire apartment complex have no rats?
  2973. Your Answer
  2974. D. 33
  2975. Question Number 46  Points: 1.00/1.00
  2976. Question Text
  2977. A group of students are asked questions to determine what learning strategy they utilize. What type of study design is this an example of?
  2978. Your Answer
  2979. A. Survey
  2980. Question Number 47  Points: 0.00/1.00
  2981. Question Text
  2982. What is the definition of an explanatory variable?
  2983. Your Answer
  2984. C. Something that can be changed
  2985. Question Number 48  Points: 0.00/1.00
  2986. Question Text
  2987. A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats {2, 5, 3, 1, 0, 3, 7, 2, 2}. What is the frequency of units with no rats?
  2988. Your Answer
  2989. C. 3
  2990. Question Number 49  Points: 1.00/1.00
  2991. Question Text
  2992. To determine the effectiveness of an exercise plan on weight-loss, participants are divided into two groups. One group is given an exercise plan and the second group is responsible for creating their own exercise plan. After 8 weeks, the results of the participants in each group are observed. What type of study design is this an example of?
  2993. Your Answer
  2994. C. Experiment
  2995. Question Number 50  Points: 0.00/1.00
  2996. Question Text
  2997. A candle company sets up a booth and has participants choose scent A or scent B. What type of study design is this an example of?
  2998. Your Answer
  2999. B. Observational Study
  3000. Question Number 51  Points: 1.00/1.00
  3001. Question Text
  3002. Pie charts are especially useful for representing which type of data?
  3003. Your Answer
  3004. C. Parts of a whole
  3005. Question Number 52  Points: 0.00/1.00
  3006. Question Text
  3007. Doctors want to determine the best medication for Alzheimer's, medication A or medication B. They randomly choose participants to be given one of the unmarked medications. Only the researchers know which participants were given which medication. Identify the type of experiment described.
  3008. Your Answer
  3009. C. Randomized controlled double-blind experiment
  3010. Question Number 53  Points: 1.00/1.00
  3011. Question Text
  3012. What are the subjects of an experiment?
  3013. Your Answer
  3014. C. The participants in the study
  3015. Question Number 54  Points: 1.00/1.00
  3016. Question Text
  3017. Find the mode of the data: 72, 74, 70, 77, 76, 72.
  3018. Your Answer
  3019. A. 72
  3020. Question Number 55  Points: 0.00/1.00
  3021. Question Text
  3022. The city transit bus is supposed to arrive at a bus stop at 15 minutes past the hour every hour. If the arrival time has a standard deviation of 4 minutes, when should you expect the bus to arrive?
  3023. Your Answer
  3024. B. Between 4 and 15 minutes past the hour
  3025. Question Number 56  Points: 1.00/1.00
  3026. Question Text
  3027. What is the independent variable in an experiment?
  3028. Your Answer
  3029. B. The part of the experiment that is influenced and assigned to the participants.
  3030. Question Number 57  Points: 0.00/1.00
  3031. Question Text
  3032. What kind of graph is being used here to present population growth?
  3033.  
  3034.  
  3035. Click here for a long description of the image above.
  3036.  
  3037. Your Answer
  3038. D. All of these
  3039. Question Number 58  Points: 0.00/1.00
  3040. Question Text
  3041. There are an estimated 12,000 houses in a certain city. The city wanted to find out what percentage of houses have more than 1 floor. It did a survey of 400 households and found that 160 of the houses have more than 1 floor. What is the sample size of this study?
  3042. Your Answer
  3043. D. 12,000
  3044. Question Number 59  Points: 0.00/1.00
  3045. Question Text
  3046. When there is a decrease from one data point to the next in a line graph, what type of slope does the line that connects them have?
  3047. Your Answer
  3048. C. Undefined
  3049. Question Number 60  Points: 1.00/1.00
  3050. Question Text
  3051. The pie chart below shows the results of a survey of 120 people.
  3052. Circle chart with 4 sectors:  Republican 36 %, Democrat 31 percent, Independent 18 %, and not registered 15 %.
  3053. How many people in the survey are registered as Democrats? Be sure to round decimal answers to the nearest whole number.
  3054. Your Answer
  3055. C. 37
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