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 Answer of 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.

In Testing for Differences Between the Means of 2 Related