If the regression slopes of the dependent variable (Y) on the covariate (X) are substantially different across the groups, one would expect that
A) the adjusted means will be biased.
B) Y is independent of X.
C) the factor is not independent of X.
D) there is a modest effect with equal n's in quasi-experiment.

Question

Quizplus · Accepted Answer

When regression slopes differ substantially across groups, it indicates an interaction between the covariate and the grouping factor, leading to biased adjusted means if not properly accounted for.

If the Regression Slopes of the Dependent Variable (Y) on the Covariate