calculator Confidence for interval Confidence interval calculator for two proportions Z frac hat p_1 - hat p_2 sqrt bar p 1-bar p frac 1 n_1 frac 1 n_2 z pˉ1pˉn11 n21p1 p2. The formula for a z-statistic for two popu… Senin, 12 September 2022 Edit