A social psychologist is interested in understanding how the use of anti-depressants affects an individual’s social life. He creates a scale where a score of 10 equals “highly social” and 1 indicates “highly unsocial.” The psychologist then asks his subjects several questions before beginning anti-depressants and again after they have been taking them for three months. The following table summarizes each subject’s scores on the scale. Test the null hypothesis that anti-depressants have no impact on an individual’s social life.

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Subject Before ABCDEFGH I J 4 5 3 1 6 7 4 2 3 1 After 7 345w ∞ a FSL 5 4 6 7 8 7