Problem 81E

Children’s recall of TV ads. Refer to the Journal of Advertising (Spring 2006) study of children’s recall of television commercials, Exercise 8.15 (p. 434). You used a smallsample t-test to test the null hypothesis , where m1 = mean number of ads recalled by children in the video only group and m2 = mean number of ads recalled by children in the A/V group. Summary statistics for the study are reproduced in the table below. The validity of the inference derived from the test is based on the assumption of equal group variances, i.e., .

a. Set up the null and alternative hypotheses for testing this assumption.

b. Compute the test statistic.

c. Find the rejection region for the test using α = .10.

d. Make the appropriate conclusion in the words of the problem.

e. Comment on the validity of the inference derived about the difference in population means in Exercise 8.15.

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