Use a significance level of alpha = 0.05 to test the claim that P1 = P2. Use the given sample sizes and numbers of successes to find (a) the pooled estimate p, (b) the z test statistic, (c) the critical z-values, and (d) the P-value.
Treatment Group: n1 =280 X1 = 70
Placebo Group: n2 = 450 X2 = 90
Since for Treatment Group, n1 = 280 and X1 = 70, then p1=x1/n1 = 70/280 = 0.25
Since for Placebo Group, n2 = 450 and X2 = 90, then p2 = x2/n2 = 90/450 = …
In this solution we use a significance level of alpha = 0.05 to test the claim that P1 = P2.