If we are testing for the difference between the means of 2 independent populations presuming equal variances with samples of n₁ = 20 and n₂ = 20,the number of degrees of freedom is equal to A)39. B)38. C)19. D)18.

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When testing for the difference between the means of two independent populations with equal variances, the degrees of freedom is calculated as n1 + n2 - 2. Here, 20 + 20 - 2 = 38.

If We Are Testing for the Difference Between the Means