Revisit exercise 9, where we develop an estimated regression equation that can be used to predict the selling price given the number of bathrooms, square footage, and number of bedrooms in the house. 

a. Does the estimated regression equation provide a good fit to the data? Explain. 

b. In part c of exercise 9 you developed an estimated regression equation that predicts selling price given the square footage and number of bedrooms. Compare the fit for this simpler model to that of the model that also includes number of bathrooms as an independent variable.