The estimated standard error of difference is an estimate of the variability occurring within the entire distribution of differences.

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The estimated standard error of difference is a measure of the uncertainty associated with the difference between two sample means, taking into account the sample sizes and standard deviations of the two samples. It is a measure of the variability within the distribution of differences, not the entire distribution of differences.

The Estimated Standard Error of Difference Is an Estimate of the Variability