Use a $\alpha = 0.05$ significance level to test the claim that $\sigma = 12$ if the sample statistics include $n = 19,$ $\overline{x} = 93,$ and $s = 21.$
The test statistic is
The smaller critical number is
The bigger critical number is
What is your conclusion?

A. There is not sufficient evidence to warrant the rejection of the claim that the population standard deviation is equal to 12
B. There is sufficient evidence to warrant the rejection of the claim that the population standard deviation is equal to 12