Exercise 16-5 Algo Consider the following sample regressions for the linear. the quadratic. and the cubic models along with their respective 122 and adjusted R2. Linea: Quadratic Cubic Intercept 9'. 33 9 . 66 9 .72 x 2.57 2.66 1.11 x2 In u.3o o.32 x3 NIL up. 0.25 R2 0.733 0.80? 0.355 Adjusted 32 0.781 0.305 0.364 a. Predict yfor x =4 and 5 with each of the estimated models. {Round intermediate calculations to at least 4 decimal places and nal answers to 2 decimal places.) b. Select the most appropriate model. 0 Linear model 0 Quadratic model 0 Cubic model