roblem (6) A study used 1259 patients who had suffered a stroke. The study randomly assigned each subject to ar aspirin treatment or a placebo treatment. During a 3-year follow-up period, in Sample 1, 634 people received placebo treatments and 25 people died from heart attack. In sample 2, 625 people received aspirin treatment and 18 died from heart attack. Let pl denote the population proportion of death from heart attack for those with no treatment and p2 denote the population proportion of death from heart attack for those with aspirin treatment. (a) What is the sampling distribution of pi and p2? State the assumptions on which the sampling distribution is based. (b) Assuming that the two population proportions are the same, let SEo denote the standard error of pm – P2 - Without this assumption, the standard error is denoted SE1. Find SEo and SE.

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