In Performing Hypothesis Tests About the Population Mean, the Population

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, a t test can be used to test the mean if ___.

A) the sample size is at least thirty
B) the sample is random
C) the population mean is known
D) the population is normally distributed
E) the population is chi-square distributed