3.9.A—Calculate the mean and standard deviation of the sampling distribution for the difference between two sample…

Calculate the mean and standard deviation of the sampling distribution for the difference between two sample proportions.

• For two independent populations, with population proportions p1 and p2, when the sampled values are independent, the s ampling distribution for the difference in sample proportions, p p , has a mean, pp pp12 12 and standar 12 d deviation, pp pp n pp n12 11 1 22 2 11 .