If an independent t ratio is to be calculated for a two-group design, 20 subjects in each group, then the degrees of freedom equal
A) 1
B) .05
C) 40
D) 38

Question

Quizplus · Accepted Answer

The degrees of freedom for an independent t ratio in a two-group design with 20 subjects in each group is calculated as follows: n1 + n2 - 2 = 20 + 20 - 2 = 38. Therefore, the correct answer is D, 38.

If an Independent T Ratio Is to Be Calculated for a Two-Group