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How is the standard deviation of the comparison distribution in a between-groups t-test determined? A. By averaging the standard deviations of the two groups. B.

How is the standard deviation of the comparison distribution in a between-groups t-test determined? A. By averaging the standard deviations of the two groups. B. From the variance estimates of the distributions of means for each group. C. By calculating the range of scores within each group. D. Using the pooled standard deviation of both groups

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