Refer to Exercises 7.77 and 7.78. Conduct a twosample t-test (Section 7.1) of the null hypothesis that the two treatment means are equal for each dot plot.

Use a = .05 and two-tailed tests. In the course of the test, compare each of the following with the F-tests in Exercise 7.78:

a. The pooled variances and the MSEs

b. The t- and F-test statistics

c. The tabled values of t and F that determine the rejection regions

d. The conclusions of the t- and F-tests

e. The assumptions that must be made in order to ensure the validity of the t- and F-tests