Suppose the underlying distribution is known to be normal,or that the sample size is at least thirty (30).The t-test is the appropriate test statistic when the sample standard deviation is used to estimate the population standard deviation.

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Quizplus · Accepted Answer

The t-test can be used when the population standard deviation is unknown and the sample size is small (less than 30), but when the sample size is at least 30 or the underlying distribution is known to be normal, the t-test can still be used with the sample standard deviation used to estimate the population standard deviation.

Suppose the Underlying Distribution Is Known to Be Normal,or That