5. Imagine that I have a drug that I believe will raise people's IQs temporarily. Using the following measurement of people's IQs after having taken the drug, conduct a two-tailed z-test against the null hypothesis that the mean is 100. N = 20 103 117 88 96 117 99 104 140 102 85 126 97/95 120 110 144 103 113 110 83 Be sure to include in your answer the mean and so of the data, formal statements of the null and alternative hypotheses, the critical value of z, the observed value of z, a statement of the statistical result, and an English-language statement of you conclusion. 6. Imagine that I have a therapy that I believe will lower people's anxiety levels. I do not know the population parameters for the anxiety test that I am using, however. So I give my participants the test prior to therapy, then again after a course of the therapy. My data are as follows: Before: 49 68 54 38 52 49 57 36 56 56 41 35 53 53 67 55 63 68 60 55 After: 41 30 45 54 52 48 59 42 64 45 50 40 44 45 44 45 31 52 33 49 Again, be sure to include in your answer the mean and so of the data, formal statements of the null and alternative hypotheses, the critical value of z, the observed value of z, a statement of the statistical result, and an English-language statement of you conclusion. 7. I theorize that simply having someone to talk with about their feelings for an hour a day will raise the mood of people with moderate levels of depression. For a control group, I use depressed people who talk with someone about current events for an hour a day. I do not know the population parameters of my test of mood. My data are as follows. F: 33 49 25 26 27 20 7 31 26 21 9 25 29 30 41 35 15 17 30 31 CE: 10 20 20 22 33 29 29 32 19 24 27 16 21 20 15 24 25 17 23 22 16 18 26 16 Again, be sure to include in your answer... [same as in Questions 5 and 6]