28. In Chapter 14, Problem 14, p. 387, an experiment was conducted to determine if an experimental birth control pill has the side effect of changing blood pressure. Ten women were randomly sampled from the city in which you live. Five of them were given a placebo for a month and then their diastolic blood pressure was measured. Then they were switched to the birth control pill for a month and again blood pressure was measured.

The other fi ve women were given the birth control pill fi rst for a month, followed by the placebo for a month. The blood pressure readings are again shown here.

In that problem, the sampling distribution of D was assumed to be normally distributed, and the analysis was conducted using the t test for correlated groups. For this problem, assume the data are so far from normally distributed as to invalidate use of the t test for correlated groups. Analyze the data with the Wilcoxon signed ranks test. What do you conclude, using 0.012 tail? biological, health, social

Diastolic Blood Pressure Subject No. Birth control pill Placebo 1 108 102 234567% 0 76 68 69 66 78 71 74 76 85 80 79 82 9 10 888 78 79 80 78 81 85