Which source of variability does not require the grand mean in its calculation?
A) between-groups sum of squares
B) within-groups sum of squares
C) sum of squares for the interaction
D) total sum of squares

Question

Quizplus · Accepted Answer

The within-groups sum of squares does not require the grand mean in its calculation because it only takes into account the variability within each group or treatment condition. The other sources of variability (between-groups, interaction, and total) all involve comparing the means of different groups or conditions to the grand mean.

Which Source of Variability Does Not Require the Grand Mean