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Pooled Within-Groups Standard Deviation

The pooled within-groups standard deviation is a type of combined average of two separate group standard deviations, typically used as the denominator when calculating Cohen's d. It is computed by adding the sum of squared differences for the first group to the sum of squared differences for the second group, dividing that total by the sum of both sample sizes, and extracting the square root.

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Updated 2026-05-03

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Research Methods in Psychology - 4th American Edition @ KPU