Question: Suppose your agency has been evaluating an intervention using a one-group pretest-posttest design with 427 participants. The focal variable is continuous and, in looking at

Suppose your agency has been evaluating an intervention using a one-group pretest-posttest design with 427 participants. The focal variable is continuous and, in looking at the boxplots, appears to be approximately bell-shaped. 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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