Assign 9 2 PLEASE SHOW ALL WORK Why do we prefer the t proce

Assign 9 #2 PLEASE SHOW ALL WORK

Why do we prefer the t procedures to the z procedures for inference about a population mean? z can be used only for large samples. z requires that you know the population standard deviation sigma. z requires that you can regard your data as an SRS from the population. eBook

Solution

It is OPTION B: z requires that you know the population standard deviation sigma.

[Usually, if we don\'t know the population mean, how can we know the population standard deviation?]