⟩ What are the two main reasons for using ANCOVA?
1. To increase error variance AND to adjust the means on the covariate so that the mean covariate score is the same for all participants.
2. To reduce error variance AND to explore patterns of correlations.
3. To reduce error variance AND to correct the means on the covariate.
4. To reduce error variance AND to adjust the means on the covariate so that the mean covariate score is the same for all groups.
To reduce error variance AND to adjust the means on the covariate so that the mean covariate score is the same for all groups
