Under which circumstance(s) should you avoid using analysis of covariance?
A) If you need to control for all extraneous variables on which the groups may differ.
B) If you have identified variables that have not been controlled for.
C) If you have controlled for all possible variables.
D) If you need to reduce unexplained variance.

Question

Quizplus · Accepted Answer

If you have already controlled for all possible variables, there is no need to use analysis of covariance. However, if there are extraneous variables that have not been controlled for (option B) or if you need to control for all extraneous variables (option A) or reduce unexplained variance (option D), then analysis of covariance may still be necessary.

Under Which Circumstance(s) Should You Avoid Using Analysis of Covariance