Using Confidence Intervals a. Assume that we want to use a 0.05 significance level to test the claim that P1<P2 . Which is better: A hypothesis test or a confidente interval? b. 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? c. If we want to use a 0.05 significance level to test the claim that P1<P2, what confidence level should we use? d. If we test the claim in part (c) using the sample data in Exercise 1, we get this confidence interval: −0.000508 <p1-p2- < − 0.000309. What does this confidence interval suggest about the claim?

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.