Refer to the data and requirements of Problem 2.42.

REQUIRED
A. Perform multiple regressions using all three cost drivers. Compare the adjusted R-squares and cost functions for the multiple regressions with the results of simple regressions for each potential cost driver.
B. Which cost drivers do the best job of explaining manufacturing overhead costs? Explain.
C. Select only the cost drivers that do the best job of explaining manufacturing overhead costs.
Perform multiple regression analysis for those cost drivers and write the cost function.
D. Explain why more than one cost driver is plausible for manufacturing overhead costs.