Many people argue that by increasing movie violence, we are increasing viewer aggression. Three groups of subjects have been randomly selected. All three groups watch 30 minutes from a recent movie, but each version of the movie has a different number of violent scenes. Following the movie, the subjects are then given the Thematic Apperception Test (TAT) and scored on the amount of fantasy aggression displayed (higher scores mean more aggression. The following data were obtained:
No 5 Violent 10 Violent Violence Scenes Scenes
257 369 5 9 10 8 10 12
Conduct a hypothesis test using alpha = .05 to determine whether or not movie violence increases an individual’s regression. If appropriate, calculate Tukey’s HSD.