The estimate for standard error is placed in the numerator of the test statistic for a related-samples t test.

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In a related-samples t-test, the estimate for standard error is placed in the denominator of the test statistic formula, not the numerator. The formula for the test statistic is the difference between the sample mean difference and the population mean difference (often assumed to be 0), divided by the standard error of the difference scores.

The Estimate for Standard Error Is Placed in the Numerator