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In the formula, t = (M1 - M2)/Sdifference, Sdifference is the sum of the standard deviations of the distribution of means. pooled estimate of the

In the formula, t = (M1 - M2)/Sdifference, "Sdifference" is the sum of the standard deviations of the distribution of means. pooled estimate of the populations' standard deviation. standard deviation of the distribution of differences between means. average standard deviation of the two samples

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