Which of the following is NOT true of confidence interval estimates of the difference between two population proportions? Choose the correct answer below. A. A confidence interval is used to test a claim about two population proportions. B. The confidence interval uses a standard deviation based on estimated values of the population proportions. C. If a confidence interval estimate of p 1minusp 2 does not include 0, we have evidence suggesting that p 1 and p 2 have different values. D. A confidence interval is used to estimate the difference between two population proportions.