a. Assume that we want to use a 0.05 significance level to test the claim that p1 < p2. If we want to test that claim by using a confidence interval, what confidence level should we use?
b. If we test the claim in part (a) using the sample data in Exercise 1, we get this confidence interval: -0.000508 6 p1 p2< -0.000309. What does this confidence interval suggest about the claim?
c. In general, when dealing with inferences for two population proportions, which two of the following are equivalent: confidence interval method; P-value method; critical value method?