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Mathematics, 26.12.2019 06:31 curtez11

In an investigation of pregnancy-induced hypertension, one group of women with this disorder was treated with low-dose aspirin, and a second group was given a placebo. a sample consisting of 50 women who received aspirin has mean arterial blood pressure 120mmhg and standard deviation 10mmhg; a sample of 42 women who were given the placebo has mean blood pressure 115mmhg and standard deviation 12mmhg. assume that the underlying population variances are equal. a. at the 0.05 level of significance, test the null hypothesis that the two populations of women have the same mean arterial blood pressure. b. construct a 99% confidence interval for the true difference in population means. does this interval contain the value 0?

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