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A cognitive psychologist measure the time it takes a sample of students to do a memory task. The students were divided into one of three groups:

A cognitive psychologist measure the time it takes a sample of students to do a memory task. The students were divided into one of three groups: a no distraction group, a moderate level of distraction group and a high level of distraction group. Which is the appropriate nonparmetric test to be used? Friedman; relted samples sign test or Wilcoxon signed ranks T test; Mann Whitney or Kruskal Wallis test

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