Question: which of these is not related to the model sum...
Question details
Which of these is not related to the model sum of squares?
a. 
The variance explained by the first predictor/independent variable 

b. 
The variance explained by the second predictor/independent variable 

c. 
The variance explained by the main effect of the two predictors/independent variables on each other 

d. 
The variance explained by the interaction of the two predictors/independent variables on each other 