In a two-sample test for means with the population variance being known, the z-test uses a test statistic that is based on the standard normal distribution.

Name: In a two-sample test for means with the population variance being known, the z-test uses a test statistic that is based on the standard normal distribution.
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In a two-sample test for means where the population variances are known, the z-test is appropriate and the test statistic is calculated based on the standard normal distribution.

In a Two-Sample Test for Means with the Population Variance