A psychology class performed an experiment to determine whether a recall score in which instructions to form

Question:

A psychology class performed an experiment to determine whether a recall score in which instructions to form images of 25 words were given differs from an initial recall score for which no imagery instructions were given. Twenty students participated in the experiment with the results listed in the table.

a. What three testing procedures can be used to test for differences in the distribution of recall scores with and without imagery? What assumptions are required for the parametric procedure? Do these data satisfy these assumptions?
b. Use both the sign test and the Wilcoxon signed rank test to test for differences in the distributions of recall scores under these two conditions.

Distribution
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