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Scientist looked at 7 patients with edemas. They researched the fovea thickness in 7 eyes pre...

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Statistics

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

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