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In testing the difference between the means of two normally distributed populations, if 1 = 2 = 50, n 1 = 9, n 2 = 13, the degrees of freedom for the...

In testing the difference between the means of two normally distributed populations, if μ1 = μ2 = 50, n1 = 9, n2 = 13, the degrees of freedom for the t statistic equals ___________.

A. 19

B. 20

C. 22

D. 21

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