8. In another study of the effect of violent, sexually explicit material on aggres- sion, the same researchers use a within-subject design rather than independent groups (as in Exercise 7). They test...

Extracted text: 8. In another study of the effect of violent, sexually explicit material on aggres- sion, the same researchers use a within-subject design rather than independent groups (as in Exercise 7). They test the aggressiveness of 9 volunteers, expose them to a violent, sexually explicit film, and then retest their aggressiveness. The data are shown here. Did viewing the film increase aggressiveness?


Extracted text: Pretest Posttest Subject # 4 6. 1 2 8 3 7 5 4 9. 11 6 10 4 7 7 2 7 8 3 4 9. 5 Notice that the scores for Exercise 7 are identical to the scores in this exercise. Compare the t values and conclusions you would draw in each case.