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Prior to taking an aerobic lesson, each of the 12 health-club members is asked to rate...

Prior to taking an aerobic lesson, each of the 12 health-club members is asked to rate the instructor on a scale of 3=excellent; 2=good; and 1=poor. Following the class, each student is again asked to rate the same instructor. Given the following before-and-after ratings, can we conclude that there is a significant improvement in instructor’s rating at α=0.05.

students 1 2 3 4 5 6 7 8 9 10 11 12 Precourse rating 1 3 2 2 2 2 1 3 1 2 2 1 Postcourse rating 2 2 3 3 3 2 3 3 3 2 3 2

Use the proper nonparametric test, and clearly state your null and alternative hypothesis.

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