Earlier in this chapter we described a study by Bartholow and Anderson (2002) examining how the experience of violence in video games influenced aggressive behavior for males and females. Their results suggest that increased violence increase aggressive behavior for males but has little or no effect for females. The following data are measures of aggressive behavior similar to the results obtained in the study.

Nonviolent Game Violent Game Female 3 9 6 4 2 5 2 8 4 4 7 6 Male 9 12 9 16 4 13 8 17 10 13 8 13

a. Use an ANOVA with a 5 .05 to evaluate the data.

Describe the effect of the violent game compared with a nonviolent game on the aggressive behavior for males and for females.

b. Calculate the effect size (h2

) for each main effect and for the interaction.