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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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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