For an independent-groups t test, effect size can be measured using A)Cohen's d. B)the standard error of the difference between means. C)the phi coefficient. D)the c² test for independence.

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Cohen's d is a commonly used effect size measure for independent-groups t tests. It represents the difference between the means of the two groups, in standard deviation units. The larger the Cohen's d, the larger the effect size.

For an Independent-Groups T Test, Effect Size Can Be Measured