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__Sign Up__- In this file of RES 110 Entire Course you will find the next docs: RES 110 Diversity between Hispanics in America Final.doc
- RES 110 Diversity between Hispanics in America Outline.doc
- RES 110 Primary vs. Secondary Research.doc
- RES 110 Reseach Proposal on Hispanic Diversity.doc
- RES 110 Research Paper Timeline Guide.doc
- RES 110 University Library CWE questions.doc
- Mathematics - Statistics
- 1. Consider the following age data, which is the result of selecting a random sample of 20 United Airlines pilots.
- 47 45 45 52 58 55 58 44 42 38
- 45 52 48 47 51 45 52 42 37 40
- a. Compute the mean, median, mode, and standard deviation, Q1, Q3, Min, Max for the above sample data on age of pilots.
- b. In the context of this situation, interpret the Median, Q1, and Q3.
- 2. Consider the following data on customers at an office supply store. These customers are categorized by their previous volume purchases and their age.
- 20's
- 30's
- 40's
- 50 or older
- Total
- New Customer
- 513
- 285
- 1,228
- 100
- 2,126
- Low Volume
- 417
- 139
- 2,578
- 215
- 3,349
- Mid Volume
- 250
- 451
- 7,859
- 801
- 9,361
- High Volume
- 100
- 615
- 6,525
- 994
- 8,234
- Total
- 1,280
- 1,490
- 18,190
- 2,110
- 23,070
- If you choose one customer at random, then find the probability that the customer
- a. is a new customer.
- b. is a high volume customer and is in the 40's.
- c. is in the 20's, given that the customer is low volume.
- 3. A source in the Internal Revenue Service has stated that historically 90% of federal tax returns filed are free of arithmetic errors. A random sample of 25 returns are selected and checked carefully for arithmetic errors. Assuming independence, find the probability that
- a. all 25 returns are free of arithmetic errors.
- b. at most 23 returns are free of arithmetic errors.
- c. more than 17 are free of arithmetic errors. (Points : 18)
- 4. The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. The distribution of mean response times to fire calls follows a normal distribution with a mean of 12.8 minutes and a standard deviation of 3.7 minutes.
- a. Find the probability that a randomly selected response time is less than 15 minutes.
- b. Find the probability that a randomly selected response time is between 13 minutes and 15 minutes.
- c. The fastest 20% of fire departments will be singled out for a special safety award. How fast must a fire department be in order to qualify for the special safety award?
- 5. A new brand of laptop battery is produced by ZELCO. The company claims that the battery will last for an extended period of time before a recharge is necessary. A sample of 40 batteries is tested for the length of usage time to recharge. The sample results are as follows:
- Sample
- Sample hrs.
- Sample Standard hrs.
- a. Construct a 99% confidence interval for the average length of usage time to recharge.
- b. Interpret this interval.
- c. How large a sample size will need to be selected if we wish to have a 99% confidence interva
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