Wal-Mart is the second largest retailer in the world. The data file on the disk holds monthly data on Wal-Mart’s revenue, along with several possibly related economic variables.

a) Using computer software, find the regression equation predicting Wal-Mart revenues from the Retail Index, the Consumer Price index (CPI), and Personal Consumption.

b) Does it seem that Wal-Mart’s revenue is closely related to the general state of the economy?