l. Explain why the tests of model adequacy conducted in this case study give no assurance that Model 4 will be a successful predictor of sale price in the future. 2. After you have covered Section 5.11, return to this case study and use the data-splitting technique to assess the external validity of Model 4. @ TAMSALESS 3. Recall that the data for this case study are des- cribed in Appendix E. The full data set, named TAM- SALESS, contains sale price information for the four neighborhoods compared in this case study, as well as sale price information for four additional neighbor- hoods (Avila, Carrollwood, Tampa Palms, and Town & Country). Use the full data set to build a regression model for sale price of a residential property. Part of your analysis will involve a comparison of the eight neighborhoods