Analysis of covariance is the preferred test rather than analysis of variance when
A) there are initial differences between the samples on a measured variable related to the dependent variable.
B) there are extreme differences in the sample variances.
C) the scores of the groups being compared are in the form of categorical frequency counts.
D) the scores of the groups being compared are in the form of ranks.

Question

Quizplus · Accepted Answer

Analysis of covariance (ANCOVA) is used over analysis of variance (ANOVA) when there are pre-existing differences between the groups on a covariate that is related to the dependent variable. ANCOVA can adjust for these differences, making the groups more comparable.

Analysis of Covariance Is the Preferred Test Rather Than Analysis