3. It has been suggested that night shift workers show more variability in their output levels than do day workers. Below are the results of two independent random samples. Night Shift Day Shift Sample size 9 8 Sample mean 520 540 Sample variance 25 23 a. State the null and alternative hypotheses to be tested. b. Compute the test statistic. c. The null hypothesis is to be tested at the 5% level of significance. State the decision rule for the test. d. What do you conclude