1. A 'rare' outcome, due to an extreme value found for the sample mean relative to the population mean, signifies that the null hypothesis should be:Answera. retainedb. rejectedc. acceptedd. none of the above
Question 21. To express a sample mean as a Z value:Answera. subtract the hypothesized population mean.b. subtract the hypothesized population mean and divide by the standard deviation.c. subtract the hypothesized population mean and divide by the standard error of the mean.d. subtract the hypothesized population mean and divide by the variance.Question 31. Given critical z values of ±1.96 and an observed z value of -2.40, the appropriate decision is to:Answera. neither retain nor reject, but conduct another investigationb. neither retain nor reject, but increase the size of the samplec. reject the null hypothesisd. retain the null hypothesisQuestion 41. Given an observed difference between a sample mean of 42 and a hypothesized population mean of 50, you:Answera. can conclude that the null hypothesis is trueb. must determine whether this observed difference can reasonably be attributed to chancec. can retain, but not accept, the null hypothesisd. can conclude that the alternative hypothesis is trueQuestion 51. A decision to reject the null hypothesis implies that:Answera. there is a lack of support for the alternative hypothesisb. there is support for the alternative hypothesisc. the sample is probably not representatived. the sample size is probably too smalle. none of the aboveQuestion 61. Compared to a two-tailed hypothesis test, a one-tailed test is more likely to detect a:Answera. true null hypothesisb. false null hypothesis in the direction of concernc. false null hypothesisd. true null hypothesis in the direction of concern
Question 71. When the rejection of a true null hypothesis would have unusually disastrous consequences, it is best to set your level of significance equal to:Answera. .10b. .05c. .01d. .001Question 81. If your observed sample mean were exactly equal to your population mean (assuming some moderate variation in both the sample and the population), then your z value would be:Answer1. 1.962. 1.653. 2.584. 05. not enough information to determineQuestion 91. In an experiment to determine whether TV cartoons produce more aggressive behavior in grade school children, the null hypothesis would state that TV cartoons have:Answera. an effect on aggressive behaviorb. only a slight effect on aggressive behaviorc. no effect on aggressive behaviord. a statistically significant effect on aggressive behaviorQuestion 101. If the null hypothesis is in reality false, and the z value of the randomly selected sample doesn't deviate beyond the critical z value, the null hypothesis will be:Answer1. correctly retained2. correctly rejected3. incorrectly retained4. incorrectly rejectedQuestion 111. Two ways to increase the likelihood of detecting a real effect are to _______ sample size and to _______ alpha.Answera. increase; decreaseb. increase; increasec. decrease; decreased. decrease; increaseQuestion 121. You're testing a new vitamin pill that could save many lives if it works even a little bit, and would do no harm even if it did not have any real effect. Given that there is often a trade off between risking Type I and Type II error, which type should you concentrate on minimizing in this situation?Answera. Type I errorb. Type II errorc. both Type I and Type II error are equally badd. Type III error; I don't know what it is, but I don't like it.