If we are testing for the difference between the means of two paired populations with samples of n1 = 20 and n2 = 20,the number of degrees of freedom is

If we are testing for the difference between the means of two paired populations 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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