Scientist looked at 7 patients with edemas. They researched thefovea thickness in 7 eyes pre and post surgery. The resultspresented from surgery are
shown in the following table:
Subject: Pre-op Thickness: Post-op Thickness: Difference (Preminus Post)
1 200 690 -490
2 840 280 560
3 470 230 240
4 690 200 490
5 560 730 -170
6 500 210 290
7 440 200 240
A) Find out whether we should conclude that surgery is effectiveon reducing foveal thickness. Compute the observed value of thetest statistic for the Sign test and calculate a p-value within thetables accuracy. To calculate p-value use poisson table.
B) Using the Wilcoxon signed rank test compute the observed teststatistic
C) Talk about the validity of utilizing either the Wilcoxonsigned-rank test, the sign test, and the paired t-test for thesedata. What assumptions must be made for each of these test to bevalid?
MUST SHOW / EXPLAIN ALL WORK BY HAND
