Because a one-way within-subjects ANOVA has two sources of error,it is generally associated with more error variability than a one-way between-subjects ANOVA.

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A one-way within-subjects ANOVA typically has less error variability because it controls for individual differences by using the same subjects across all conditions, thus reducing the error variance compared to a one-way between-subjects ANOVA where different subjects are used in each condition.

Because a One-Way Within-Subjects ANOVA Has Two Sources of Error,it