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

Scientist looked at 7 patients with edemas. They researched the fovea thickness in 7 eyes pre and post surgery. The results presented from surgery are

shown in the following table:

Subject: Pre-op Thickness: Post-op Thickness: Difference (Pre minus 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 effective on reducing foveal thickness. Compute the observed value of the test statistic for the Sign test and calculate a p-value within the tables accuracy. To calculate p-value use poisson table.

B) Using the Wilcoxon signed rank test compute the observed test statistic

C) Talk about the validity of utilizing either the Wilcoxon signed-rank test, the sign test, and the paired t-test for these data. What assumptions must be made for each of these test to be valid?

MUST SHOW / EXPLAIN ALL WORK BY HAND

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