The single-sample t test compares the mean of a sample to a population for which the mean but not the standard deviation is known.

Name: The single-sample t test compares the mean of a sample to a population for which the mean but not the standard deviation is known.
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The single-sample t test is used when the mean of a sample is being compared to a population for which the mean is known but the standard deviation is unknown. However, if the standard deviation is known, a z-test can be used instead.

The Single-Sample T Test Compares the Mean of a Sample