Experimental PSY

Question

Danielle is hosting a tug-of-war contest between two groups. Group A has 12 people on their team and Group B has 9 people on their team. How would she determine the degrees of freedom between the two groups? What are the degrees of freedom between the two groups? You must show your work. (Inferential Stats: t-Tests).

Group A….. Group B…..

12 9

Answer 1

If we assume equal variances, this is a two-sample t-test and formula for degrees of freedom is:

df = (n1 + n2) - 2

n1 = first sample size = 12

n2 = second sample size = 9

df = (12+9) - 2

df = 19

For unequal variances, the formula is much more complicated and would require actual variances to compute. Given that you weren't given those here, I suspect this is a two-sample t-test with equal variances assumed. I hope this helps.