11.100 Recently sold, single-family homes. Refer to the National Association of Realtors data on sales price (V), region (NE, NW, S, or W), and sales volume for 28 recently sold, single-family homes, Exercise 11.89 (p. 681). The data are saved in the NAR file. In Exercise 11.89, you fit a complete second-order model for Ely) as a function of region and sales volurne, a. Conduct a nested-model F-test to determine whether the quadratic terms in the model are statistically useful for predicting sales price (). Use a = .05, h. Based on the result, part a, which of the nested mod- els (the complete or the reduced model) do you prefer to use in predicting sales price (y)? Explain. c. Refer to part b. Treat the preferred model as the com- plete model and conduct a nested model F-test to de- termine whether region and sales volume interact to affect sales price (y). Use a = .05. d. Based on the result, part c, which of the nested models (the complete or the reduced model) do you prefer to use in predicting sales price (y)? Explain,