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

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The degrees of freedom for a test involving the differences between the means of 2 related populations, where the variance is unknown, is n - 1. This is because the test typically involves paired samples, and the degrees of freedom are calculated based on the number of pairs (n) minus 1.

In Testing for Differences Between the Means of 2 Related