For a study to have an impressive effect size, if the variance in scores is high, the magnitude of difference in mean scores between the two groups must be small.

Question

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For a study to have an impressive effect size, the magnitude of difference in mean scores between the two groups must be large, regardless of the variance in scores. This means that a small effect size can be impressive if the difference between the means is large enough, even if the variance in scores is high.

For a Study to Have an Impressive Effect Size, If