We know the variance of each sample mean alone from

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Unformatted text preview: edom for MS for the independent ­samples t ­ test is discussed below. Standard error of MA – MB. The standard error of any statistic is the standard deviation of its sampling distribution, which in turn is the square root of its variance. So, let’s think about the variance of MA – MB. It turns out this is just the variance of MA plus (not minus!) the variance of MB. If you think of variance as uncertainty, then the uncertainty in MA – MB is the sum of the uncertainties coming from each of MA and MB. We know the variance o...
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