The estimated standard error in the denominator of the repeated-measures t statistic measures the average mean difference that is expected for a sample when there is a zero mean difference for the population.

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The estimated standard error in the denominator of the repeated-measures t statistic indeed measures the average mean difference expected for a sample when there is a zero mean difference in the population. It quantifies the variability of the sample mean differences around the population mean difference, which is assumed to be zero under the null hypothesis.

The Estimated Standard Error in the Denominator of the Repeated-Measures