When testing a value of the population mean, if the population variance is unknown, then we must do a t-test

Name: When testing a value of the population mean, if the population variance is unknown, then we must do a t-test
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When the population variance is unknown, we use the t-distribution and perform a t-test to test the hypothesis about the population mean. If the population variance is known, we can use the z-distribution and perform a z-test.

When Testing a Value of the Population Mean, If the Population