Analysis Of Covariance (ANCOVA)

ANCOVA is a statistically linear model which is a combination of ANOVA and regression and separating variation of dependent variables by independent variable groups. It is same as ANOVA, but the difference is that it estimates coalition between independent variables. To check uniformity in variance/regression slopes, ANCOVA heavily uses assumption testing.

By removing covariance effects by lowering the within variance, ANCOVA increases the chances of finding statistical significance and thus is useful in homework.