In performing hypothesis tests about the population mean, the population standard deviation should be used if it is known.If it is not known, which of the following statistical test should be used? A)z test of a population mean B)t test of a population mean C)z test of a population proportion D)$\chi$² test of a population variance E)t test of a population proportion

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If the population standard deviation is not known, the appropriate statistical test to use is the t test of a population mean. This test uses the sample standard deviation to estimate the population standard deviation.

In Performing Hypothesis Tests About the Population Mean, the Population χ\chiχ

In Performing Hypothesis Tests About the Population Mean, the Population $\chi$