In testing the difference between two proportions using the normal distribution,we may use either a one-tailed or two-tailed test.

Question

Quizplus · Accepted Answer

This is true. A one-tailed test is used when we have a prior expectation of the direction of the difference between the two proportions (e.g. we expect one proportion to be larger than the other), while a two-tailed test is used when we do not have a prior expectation of the direction of the difference.

In Testing the Difference Between Two Proportions Using the Normal