When performing a two-way between-groups ANOVA, effect size is measured using _____, and it is calculated for _____ effects. A) Cohen's d; two B) R²; two C) Cohen's d; three D) R²; three

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Eta squared (η²) is used to measure effect size in a two-way between-groups ANOVA, and it is calculated for both main effects and the interaction effect, totaling three effects.

When Performing a Two-Way Between-Groups ANOVA, Effect Size Is Measured