When using a mixed ANOVA approach to analyze a pretest-posttest design, a significant main effect for the within-subjects IV could be due to the internal validity threat of maturation.

Question

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A significant main effect for the within-subjects IV could be due to the natural changes that occur over time, which is known as the maturation threat to internal validity.

When Using a Mixed ANOVA Approach to Analyze a Pretest-Posttest