To investigate pregnancy-induced hypertension, one group of hypertensive pregnant women were treated with low dose aspirin and a second group was given a placebo. For the 23 women who received aspirin, the sample mean arterial blood pressure was 111 mm Hg with standard deviation 8 mm Hg. For the 24 women in the placebo group, the sample mean was 109 mm Hg and the standard deviation was 8 mm Hg. (a) At = 0.01, test the null hypothesis that the two populations of women have the same mean arterial blood pressure. Present a conclusion to address the scientific question. (b) Construct a 99% confidence interval for the difference in population means. Does this interval contain 0? Based on the result of your significance test, would you expect it to contain 0?

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