A t-test is used when the sample size in both groups is relatively large and the population standard deviation is known.

Name: A t-test is used when the sample size in both groups is relatively large and the population standard deviation is known.
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A t-test is used when the sample size is relatively small (typically less than 30) and/or the population standard deviation is unknown. When the sample size is large and the population standard deviation is known, a z-test may be more appropriate.

A T-Test Is Used When the Sample Size in Both