Pooled standard deviation,part of the formula for the Cohen's d effect size,is similar to an average of the standard deviations from both groups.

Name: Pooled standard deviation,part of the formula for the Cohen's d effect size,is similar to an average of the standard deviations from both groups.
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Pooled standard deviation is calculated by taking the average of the standard deviations from both groups, hence it is similar to an average of the standard deviations from both groups.

Pooled Standard Deviation,part of the Formula for the Cohen's D