In the following situation, which test should be used? Independent variable = pretest vs. posttest measurement; dependent variable = stress measured on a 7-point scale

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The Wilcoxon test (or paired samples t-test) should be used in this situation to compare the pretest and posttest measurements of the dependent variable (stress measured on a 7-point scale) for each individual participant. This is because the measurements are related to each other (i.e. they are paired), and the test is appropriate for non-normally distributed data, which may be the case for stress measurements on a 7-point scale.

In the Following Situation, Which Test Should Be Used? Independent