USE SAS

The goal is to build a model about livingarea.

a) model has 5 predictors: sellprice, listprice, age, acres, taxes. Is multicollinearity a serious problem? How can you fix it?

b)what is the amount of extra sum of squares for adding age and taxes to model when variables listprice and acres are already in the model?

c)do a hypothesis test to see if both age and taxes are equal to zero when the full model also have listprice and acres in model