Question: If we are testing for the difference between the means of 2 independent populations presuming equal variances with samples of n1 = 20 and n2

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 None of these options 38 39 19 18

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