Question: 8. In Chapter 19, we learned that to compute a 90% confidence interval, we add and subtract 1.645 rather than 2 times the measure of

8. In Chapter 19, we learned that to compute a 90% confidence interval, we add and subtract 1.645 rather than 2 times the measure of uncertainty. In this chapter, we revisited Case Study 6.2 and found that a 95% confidence interval for the difference in mean DHEA-S levels for 45- to 49-year-old women who meditated compared with those who did not extended from –3.6 to 61.6.

a. Compute a 90% confidence interval for the difference in mean DHEA-S levels for this group.

b. Based on your result in part

a, could you conclude with 90% confidence that the difference observed in the samples represents a real difference in the populations? Explain.

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