16. An experiment was designed to study the effects of three different drugs and three types of stressful situation in producing anxiety in adolescent subjects. The table shows the difference between the pre- and posttreatment scores of 18 subjects who participated in the experiment.

Stressful Situation Drug (Factor B)

(Factor A) A B 4 1 1 5 3 0 6 6 6 6 6 3 5 7 4 4 4 5 I

II III Perform an analysis of variance of these data and test the three possible hypotheses. Let a' = a" = a"' = .05. Determine the p values.