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In a study on attraction, suppose subjects were asked to rate pictures of females and males...

In a study on attraction, suppose subjects were asked to rate pictures of females and males taken before and after a face-lift. Subjects rated the pictures on a number of variables. The total attractiveness ratings are given below, with higher numbers meaning higher attractiveness. You are asked to test whether face-lifts improve the looks of the subjects.

Subject: 1 2 3 4 5 6 7 8 9 10 11 12   13 14 15

Before: 22 24 26 20 23 22 19 18 17 16 21 23 25 27 24

After: 25 14 20 25 20 16 13 21 15 12 15 14 27 17   20

a.) Test the hypothesis at alpha = .05 level (1-tailed)

b.) What would your conclusion be if you had done a two-tailed test?

math   Statistics-And-Probability   
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