stats hw final practice 10

Question

Assume there is a sample of n1=4​, with the sample mean X1=37 and a sample standard deviation of S1=2​, and there is an independent sample of n2=5 from another population with a sample mean of X2=33 and a sample standard deviation S2=5. In performing the​ pooled-variance t​ test, how many degrees of freedom are​ there?

Answer 1

Degrees of freedom = n1 + n2 - 2 = 4 + 5 -2 = 7.