With interval data from a three-group, matched design, the appropriate test would be the within-subjects ANOVA.

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Within-subjects ANOVA is appropriate for analyzing interval data collected from a matched design, where participants are assigned to different conditions or treatments and their performance is measured at multiple time points. This test allows for the evaluation of the main effects of the treatments, as well as any interaction effects between the treatments and time points.

With Interval Data from a Three-Group, Matched Design, the Appropriate