For an independent-measures research study, what is measured by Cohen's d or r²? A)the risk of a Type I error B)the risk of a Type II error C)the size of the difference between the two treatments D)whether the difference between the two treatments is likely to have occurred by chance

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Cohen's d and r² are measures of effect size, which quantify the size of the difference between two treatments or groups in an independent-measures research study.

For an Independent-Measures Research Study, What Is Measured by Cohen's