Question

Question 7 Not yet answered Points out of 1.00 P Flag question Suppose you are conducting a pool-variance t-test to test the difference in two population means. You take a random sample of size 20 from population 1 and a random sample of size 25 from population 2. What are the degrees of freedom? Select one: 43 46 44 45 None of these are correct

Answer 1

The correct option is (1), i.e., 43

For a pool-variance t-test the degrees of freesom is given by $\small \mathbf{df=n_{1}+n_{2}-2}$

where, $\small \mathrm{n_{1}:sample\:size\:from\:population\:1}$ ; $\small \mathrm{n_{2}:sample\:size\:from\:population\:2}$

In the given question, $\small n_{1}=20;\:n_{2}=25$ , then the degrees of freedom is-

df = nu + n2 - 2 = 20 + 25 - 2 = 45 - 2 = 43