Which of the following best describes how many covariates can be included in an ANCOVA?
A. Only one covariate can be included.
B. You can include as many covariates as you like.
C. It is a good idea to keep the number of covariates to a minimum.
D. A good rule of thumb is to include one covariate fewer than the number of levels of the independent variable, or less.
Answer: C
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