If you're comparing the test scores between two classrooms,you should use a one-sample Z-test.

Name: If you're comparing the test scores between two classrooms,you should use a one-sample Z-test.
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When comparing the test scores between two classrooms, you should use a two-sample Z-test (if the population variance is known) or a two-sample t-test (if the population variance is unknown), not a one-sample Z-test, which is used to compare a single sample to a population.

If You're Comparing the Test Scores Between Two Classrooms,you Should