Stats Solutions

(See Steps) In another study of the effect of violent, sexually explicit material on aggression, the same researchers use a within-subject design rather than

Question: In another study of the effect of violent, sexually explicit material on aggression, 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?

Subject

Pretest

Posttest
1 4 6
2 5 8
3 7 5
4 9 11
5 6 10
6 4 7
7 2 7
8 3 4
9 5 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.

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