Question

Assume that the results of an F-test are reported as: F(2, 42) = 7.30, p = .01. On the basis of this information we may conclude that here were ___________ independent groups in this experiment.

a. Two
b. Three
c. Four
d. Five

Answer 1

b. Three

Explanation:

From theory we know that the first degree of freedom in an F-test is the number of groups in the experiment minus one. And that the second degree of freedom is the number of observations minus the number of groups.

Representing the number of groups as N. Then we can find the value of N with the following equation

`N-1=2`,

which implies that
`N=3`