In an analysis of variance summary table, the df for groups always equals
A) the number of groups.
B) the number of groups minus one.
C) the number of subjects per group.
D) the total number of subjects minus one.

Question

Quizplus · Accepted Answer

The df for groups is equal to the number of groups minus one, as this accounts for the one degree of freedom that is lost when estimating the group means. The other choices are not correct- A) the number of groups does not account for the one degree of freedom lost, C) the number of subjects per group is not relevant to the calculation of df for groups, and D) the total number of subjects minus one is used to calculate df for error, not df for groups.

In an Analysis of Variance Summary Table, the Df for Groups