[See] Suppose that your agency has been evaluating an intervention using a posttest-only control group design. There were 155 people in the treatment group
Question: Suppose that your agency has been evaluating an intervention using a posttest-only control group design. There were 155 people in the treatment group and 140 in the control group. The outcome variable is continuous and, according to boxplots, appears to follow a bell-shaped distribution with similar variances in the treatment and control groups. What statistical test would be most appropriate for testing the null hypothesis of no intervention effect?
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