Question: Six weeks following a post-radical prostatectomy, 20 patients completed a measure of sexual function. Erectile function scale: severe (5-7), moderate (8-11), mild to moderate (12-16), mild (17-21), and no ED (22-25). Higher scores indicate higher function. One group had been taking Viagra pre-operatively every day 0.25 mg, and the other group had not used any type of erectile aid. Using the Mann-Whitney U Test, at the \[\alpha =0.05\] level of significance, test the claim that the median of the sexual function scores for the Viagra group is more than the median of the sexual function scores for the no erectile aid group. Assume the necessary assumptions hold. (5 Marks)

Sexscore Group SixWeeksV SixMonthsV

21.00 1.00 21.00 22.00

18.00 1.00 18.00 20.00

20.00 1.00 20.00 20.00

10.00 1.00 10.00 12.00

10.00 1.00 10.00 11.00

19.00 1.00 19.00 21.00

19.00 1.00 19.00 21.00

9.00 1.00 9.00 11.00

8.00 1.00 8.00 10.00

18.00 1.00 18.00 20.00

8.00 2.00
9.00 2.00
10.00 2.00
12.00 2.00
15.00 2.00
18.00 2.00
6.00 2.00
6.00 2.00
10.00 2.00
8.00 2.00
22.00 3.00
20.00 3.00
20.00 3.00
12.00 3.00
11.00 3.00
21.00 3.00
21.00 3.00
11.00 3.00
10.00 3.00
20.00 3.00