In which of the following situations will the adjusted means always equal the unadjusted means in ANCOVA? A) All groups have the same unadjusted mean. B) All groups have the same mean on the covariate. C) The dependent variable and covariate are highly correlated. D) Regression of the dependent variable on the covariate with b_w = 0.6.

Question

Quizplus · Accepted Answer

When all groups have the same mean on the covariate, the adjustment made by ANCOVA (which corrects group means based on their covariate values) does not change the means from their original values, because the covariate does not differentiate between the groups.

In Which of the Following Situations Will the Adjusted Means