When we have an independent sample t test, the degrees of freedom are equal to A) N B) N ₁ + N ₂ - 1 C) N ₁ + N ₂ - 2 D) N - 1

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The degrees of freedom for an independent sample t-test are calculated as the sum of the sample sizes of both groups minus 2, which is represented by $N_1 + N_2 - 2$. This accounts for the two estimates that are made from the data (the means of the two groups).

When We Have an Independent Sample T Test, the Degrees