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

Multiple Choice

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