In testing for differences between the means of two related populations where the variance of the differences is unknown, the degrees of freedom are A) n - 1. B) n₁+ n₂- 2. C) n₁+ n₂- 1. D) n - 2.

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When testing for differences between the means of two related populations (paired samples), the degrees of freedom are calculated as n - 1, where n is the number of paired observations.

In Testing for Differences Between the Means of Two Related