In a two-way ANOVA,a blocking variable is used to ________.
A)increase the error sum of squares
B)decrease the error sum of squares
C)increase the treatment sum of squares
D)decrease the treatment sum of squares

Question

Quizplus · Accepted Answer

A blocking variable is used to reduce the effect of extraneous variation in the experiment, which can increase the precision of the estimate of treatment effects. Blocking can reduce the error sum of squares by accounting for the variability caused by the blocking factor, so B is the correct choice.

In a Two-Way ANOVA,a Blocking Variable Is Used to ________