The Cohen's d effect size formula is simply a z-score formula, except that instead of comparing one case's score to the group mean in the numerator, it compares two group means in the numerator.

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Quizplus · Accepted Answer

The statement is correct. The Cohen's d effect size formula compares two group means in the numerator, and the formula is similar to a z-score formula. The numerator is the difference between the means, and the denominator is the standard deviation of the pooled groups.

The Cohen's D Effect Size Formula Is Simply a Z-Score