Question: The researchers also need to obtain precise estimates of the

The researchers also need to obtain precise estimates of the mean difference in systolic blood pressures for people who use the anti-inflammatory drug versus those who do not.
a. Suppose the sample sizes are the same for both groups. What sample size is needed to obtain a 95% confidence interval for the mean difference in systolic blood pressure between the users and nonusers having a width of at most 5 mm Hg.
b. Suppose the user group will have twice as many patients as the placebo group. What sample size is needed to obtain a 95% confidence interval for the mean difference in systolic blood pressures between the users and nonusers having a width of at most 5 mm Hg.

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  • CreatedNovember 21, 2015
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