Donna Layton, an industrial engineer in the plant, was asked to

prepare an inventory cost analysis to determine the expenses

involved in holding additional finished goods inventory. Tyler

began his analysis by randomly selecting $45$ expedited shipping

records. The sampled data can be found in the file Wendell

Motors. The management team expects a full report in five days.

Tyler knew he would need a model for explaining shipping costs

for expedited orders and that he would also need to answer ques$-$tions about what effect, if any, shipping on a holiday had on costs.