myztest

Z test for the difference in two proportions

Z test to compare two different proportions, using the x1 and x2 as the
% successes of each group and n1 and n2 as the total in the group. Answer
% = the Z stat, in which the null hypthothesis is rejected if Zstat<-1.96
% or if Z>1.96 when alpha = 0.05