Refer to the Interfaces (Mar.-Apr. 1990) study of La Quinta Motor Inns, Exercise 10.13

(p. 578).The researchers used state population per inn (x,), inn room ratc (x,), median income of the area (x?), and college enrollment ( r4) to build a first-order model for operating margin (y) of a La Quinta Inn. Based on a sample of n = 57 inns, the model yielded R2 = .51.

a. Glve a descriptive measure of model adequacy.

b. Make an inference about model adequacy by conducting the appropriate test. Use a = .05.