Question: Suppose your agency has been evaluating an intervention using a one-group pretest-posttest design with 20 participants.The focal variable is continuous but, in looking at the

Suppose your agency has been evaluating an intervention using a one-group pretest-posttest design with 20 participants.The focal variable is continuous but, in looking at the boxplots, you see that it is skewed heavily to the left both before and after the intervention.What statistical test would be most appropriate for testing the null hypothesis of no intervention effect (i.e., no change from before to after the intervention)?

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