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Which standard deviation do we use to calculate t-statistic in independent-samples t-test? a. the standard deviation of the group with more participants b. the weighted

Which standard deviation do we use to calculate t-statistic in independent-samples t-test? a. the standard deviation of the group with more participants b. the weighted average of the standard deviations of two groups c. standard deviation of the whole sample d. the average of the standard deviations of two groups

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