The degrees of freedom for a denominator in a one-way ANOVA test including 3 population means with 10 observations sampled from each population is equal to:
A) 30
B) 27
C) 13
D) 12
E) 9

Question

Quizplus · Accepted Answer

For a one-way ANOVA test with k groups and n observations per group, the degrees of freedom for the denominator (error or within-group variability) is (k-1)(n-1). Therefore, in this case, the degrees of freedom for the denominator is (3-1)(10-1) = 18, which corresponds to answer choice B.

The Degrees of Freedom for a Denominator in a One-Way