Jax House Prices Data (Appendix C.6) Your goal is to model the price per square foot (PRICEPERSF=SALEPRICE/GROSSF) of homes as a function of their age. Excluding townhouses from the analysis, is age a...

Jax House Prices Data (Appendix C.6) Your goal is to model the price per square foot (PRICEPERSF=SALEPRICE/GROSSF) of homes as a function of their age. Excluding townhouses from the analysis, is age a useful predictor of PRICEPERSF? Illustrate your answer using prediction intervals for two homes, one fairly new and another fairly old. Check the assumptions of the model.