A psychologist is studying the effect of the number of hours of television children view and the primary type of program children view on the children’s level of aggression. Here are the mean aggression levels for each group (higher scores indicate more aggression):

a. What are the independent variables? What is the dependent variable?

b. How many main effects can there be in this study? How many interaction effects can there be?

c. Express the design in words.

d. Express the design in symbols.

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Hours per week <3 3-10 11-20 >20 3-10 11-20 >20 <3 3-10 11-20 >20 Type of Show Educational Educational Educational Educational Action-adventure Action-adventure Action-adventure Action-adventure Situation comedy Situation comedy Situation comedy Situation comedy Aggression Level 16 11 8 3 52 58 69 71 22 30 38 43