Clerical staff work hours
Clerical staff work hours (cont’d). Refer to the data on units of production and time worked for a department store clerical staff in Exercise 6.6. For this exercise, consider only the independent variables x1, x2, x3, and x4 in an all-possible-regressions select procedure.
(a) How many models for E(y) are possible, if the model includes (i) one variable, (ii) two variables, (iii) three variables, and (iv) four variables?
(b) For each case in part a, use a statistical software package to find the maximum R2, minimum MSE, minimum Cp, and minimum PRESS.
(c) Plot each of the quantities R2, MSE, Cp, and PRESS in part b against p, the number of predictors in the subset model.
(d) Based on the plots in part c, which variables would you select for predicting total hours worked, y?
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