If we are testing for the difference between the means of 2 related populations withsamples of n1 - 20 and n2 - 20, the number of degrees of freedom is equal to0 19.0 38. 39. 18.
Added by Teresa M.
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Since the samples are from 2 related populations (i.e., paired samples), we are dealing with a paired t-test. Show more…
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