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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.

Pooled Within-Groups Standard Deviation

How is the pooled within-groups standard deviation computed?

To determine the pooled within-groups standard deviation for use in calculating Cohen's d, arrange the mathematical steps in the correct order based on how this combined average is computed.

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