Using the U.S. total computer and software sales data for Problem 16.15 on page 625 and Problem 16.27 on page 634 (stored in Computer Sales).
a. Perform a residual analysis for each model.
b. Compute the standard error of the estimate (SYX) for each model.
c. Compute the MAD for each model.
d. On the basis of (a) through (c) and the principle of parsimony, which forecasting model would you select? Discuss.