A One-Way Analysis of Variance If Zack has 75 subjects and 72 degrees of freedom within groups in a one-way analysis of variance, his independent variable must have ___ levels.
A)3
B)4
C)5
D)6

Question

Quizplus · Accepted Answer

The number of levels in the independent variable can be determined by the formula for degrees of freedom within groups, which is N - k, where N is the total number of subjects and k is the number of groups or levels. Given 72 degrees of freedom within groups and 75 subjects, 75 - k = 72, solving for k gives 3 levels.

A One-Way Analysis of Variance If Zack Has 75 Subjects