We are interested in determining whether or not the variances of the sales at two music stores (A and B) are equal. A sample of 16 days of sales at store A has a sample standard deviation of 40 while a sample of 21 days of sales from store B has a sample standard deviation of 15.

Refer to Exhibit 2.

*The test statistic is:

*If the level of significance is 0.05, the critical value is:

*At 95% confidence the null hypothesis is: