David Desreumaux, VP of Human Resources of American First Banks (AFB), is reviewing the employee training programs of AFB.Based on a recent census of personnel, David knows that the variance of teller training time in the southeast region is 8, and he wonders if the variance in the southwest region is the same number.His staff randomly selected personnel files for 15 tellers in the southwest region, and determined that their mean training time was 25 hours and that the standard deviation was 4 hours.Assume that teller training time is normally distributed.Using $\alpha$= 0.10, the null hypothesis is ________. A)$\mu$ = 25 B)$\sigma$² = 8 C)$\sigma$² = 4 D)$\sigma$² $\le$ 8 E)s² = 16

Question

Quizplus · Accepted Answer

The null hypothesis in this context is concerned with comparing variances between two groups. Since David is interested in whether the variance of teller training time in the southwest region is the same as the southeast region (which is 8), the correct null hypothesis is that the variance in the southwest region equals 8, which matches choice B.

David Desreumaux, VP of Human Resources of American First Banks α\alphaα

David Desreumaux, VP of Human Resources of American First Banks $\alpha$