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- Two researchers make a test concerning the effectiveness of a drug use treatment. Researcher A determines that the effect size in the population of males is d=0.36; Researcher B determines that the effect size in the population of females is d=0.20. All other things being equal, which researcher has more power to detect an effect? Explain.
- Two researchers make a test concerning the levels of marital satisfaction among military families. Researcher A collects a sample of 22 married couples (n=22). Researcher B collects a sample of 40 married couples (n=40). All other things being equal, which researcher has more power to detect an effect? Explain.
- Two researchers make a test concerning the effects of music on mood. Researcher A tests the effects of rock music on mood and determines that the likelihood of committing a Type II error is B= 0.20. Researcher B tests the effects of classical music on mood and determines that the likelihood of committing a Type II error is B=0.40. All other things being equal, which researcher has more power to detect an effect?
- Which study used independent and which used dependent samples: Researchers hypothesized that the more wins a team has, the more teammates will believe in their own abilities. To test this, they selected a group of sports athletes from teams with few wins during the previous season and a second group of sports athletes from teams with many wins during the previous season. They tested whether self efficacy significantly differenced between groups. Independent or Dependent.
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