Which of the following statements is true?

a. Adjusted means reflect group means on an outcome, net of the effect of covariates.
b. Adjusted means cannot be computed when the covariate is a pretest measure of the outcome.
c. The null hypothesis in ANCOVA is that the unadjusted group means are equal.
d. If unadjusted group means are equal, the adjusted group means will also be equal.


A

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