Question: If parametric assumptions are violated for a study in which 30 participants are randomly assigned to one of three caffeine conditions (none, moderate, or high

If parametric assumptions are violated for a study in which 30 participants are randomly assigned to one of three caffeine conditions (none, moderate, or high caffeine) before completing a memory task, which test is most appropriate?

Kruskal-Wallis test

Friedman test

Wilcoxon rank sum test

Wilcoxon matched-pairs signed ranks t test

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