20 For an independentsamples t test there were 14 participan

20. For an independent-samples t test, there were 14 participants in Group 1 and 17 participants in Group 2. The total degrees of freedom were: a. 31 b. 29 c. 30 d. 28

Solution

For pooled variance case, df = (n1+nn2-2) = 14+17-2 = 29

Without pooling, conservative approach says df = minimum of (n1,n2)-1 = 13