Requirements of ANCOVA

Error terms, must be normally and independently distributed. 

The variance components of the separate treatments must be equal. 

The regression slopes among the treatments must be parallel. 

Let us work through the basic structure using the six-step procedure. Step 1 Form the test hypothesis, which will be a two-tail test. 

Step 3 Choose the model configuration (covariates to control) and dummy variable configuration. 

---