______ is an estimate of the magnitude of the difference between the means of two groups measured in standard deviation units. A) r² B) t² C) β D) Cohen's d

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Cohen's d is a commonly used measure of effect size in statistics. It is defined as the difference between the means of two groups divided by their pooled standard deviation. The result is an estimate of the magnitude of the difference between the two means measured in standard deviation units. Cohen's d is often used in hypothesis testing and power analyses, and is particularly useful when comparing means from different studies or when the standard deviations of the two groups are not equal.

______ Is an Estimate of the Magnitude of the Difference