An actuarial exam was taken by 67 candidates, of which 22 were female. The
male mean score was 71.2 and the female mean score was 76.5. The estimated
standard deviation for the male sample was 22.2 and for the female sample 18.5. On
the assumption that the sample variances are unequal, use a significance level of 0.05
to test whether there is a statistical difference in performance by gender group.