What assumption does ANCOVA have that ANOVA does not?
A) Homogeneity of variance
B) Homogeneity of regression slopes
C) Homoscedasticity
D) Homogeneity of sample size

Question

Quizplus · Accepted Answer

ANCOVA assumes both homogeneity of variance and homoscedasticity like ANOVA. However, ANCOVA also assumes homogeneity of regression slopes, meaning the relationship between the independent variable and the dependent variable is consistent across different levels of the covariate. ANOVA does not make this assumption.

What Assumption Does ANCOVA Have That ANOVA Does Not