Factorial Designs revolves an exercise wheel (in hundreds of revo-Professor Hyde studies the effects that two or more drugs have on animal activity when the drugs are administered simultaneously. She designs a study that involves two factors. Factor A consists of two levels of Drug A (3 cc, 6 cc). Factor B consists of two levels of Drug B (2 cc, 4 cc). The experimental subjects are white rats, and the dependent variable is amount of activity, as measured by the number of times each rat revolves, rounded to the nearest 100). The results of the study are given in Table 11.1

a. Calculate and graph the cell means.

b. Is there an interaction between Factors A and B? If so, explain the nature of the interaction.

c. Is there a main effect of Factor A? Explain.

d. Is there a main effect of Factor B? Explain.