For analysis of variance, an approach to effect size is to calculate the: A)size of the groups multiplied by the sample means B)proportion of variance accounted for (R²) C)difference between the two means divided by the pooled population variance D)difference between the two means divided by the pooled population standard deviation

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The proportion of variance accounted for (also known as eta-squared) is a commonly used effect size measure in ANOVA. It represents the amount of variability in the dependent variable that can be attributed to the independent variable(s). It is calculated by dividing the sum of squares for the effect by the total sum of squares.

For Analysis of Variance, an Approach to Effect Size Is