Using regression , determine the best cost formula to explain this company's monthly overhead costs . Explain how and why you reached this conclusion Clearly write out the complete cost formula ( round all amounts / rates to the nearest cent ) A complete answer will thoroughly explain not only why this cost formula is valid , but also why this model's cost driver ( or multiple cost drivers ) is /are better than any other combination of cost drivers available to predict monthly overhead costs ( For purposes of checking validity , all relevant regression assumptions should be named and adequately evaluated . Be sure to explain how you evaluated these assumptions . )