Below are two groups:
A: 15, 22, 19, 25, 16
B: 32, 25, 27, 33, 21, 35, 30
a) Test to see if the variances are the same: give the null and alternate hypotheses; then the test statistic and critical value; finally decide if you accept or reject this null hypothesis at the 5% level.
b) Now do the same for the means of the two groups.