A univariate hypothesis test using the t distribution,which is used when the standard deviation is unknown and the sample size is small,is called the z-test.

Name: A univariate hypothesis test using the t distribution,which is used when the standard deviation is unknown and the sample size is small,is called the z-test.
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A univariate hypothesis test using the t distribution is called a t-test, not a z-test. A z-test is used when the standard deviation is known or the sample size is large.

A Univariate Hypothesis Test Using the T Distribution,which Is Used