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

Name: In testing the difference between two proportions using the normal distribution, we may use either a one-tail chi-square test or two-tail Z test.
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The chi-square test can be used for one-tailed tests, and the Z test can be used for two-tailed tests when comparing two proportions.

In Testing the Difference Between Two Proportions Using the Normal