Answer to Question #40636 in Statistics and Probability for Mitch arlian
Unfortunately, the statement of your question is a bit confusing. We do not know sufficient information to solve this problem. In this problem we consider testing H0: p=p0 versus H1:p<p0. The test statistic is z=(p-p0)/Sqrt(p0(1-p0)/n). If we set the significance level alpha=0.05, the rejection region is R:z<=-1.65 (it means if z<=-1.65 the we reject H0). Please, give us the details so we could help you.
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