Question: What is pooled standard deviation? a. It is the difference in standard deviation between two groups. b. It is the sum of standard deviations across

What is pooled standard deviation? a. It is the difference in standard deviation between two groups. b. It is the sum of standard deviations across two groups. c. It is the weighted average of standard deviations across two groups. d. It is simply the average of the two standard deviations

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