In Exercise 12.35, we described how the office equipment chain OfficeMax offers rebates on some products. The goal in that exercise was to estimate the total amount spent by customers who bought the package of 100 CD-ROMS. In addition to tracking these amounts an executive also determined the amounts spent in the store by another sample of customers who purchased a fax machine/copier (regular price $89.99 minus $40 manufacturer’s rebate and $10 OfficeMax mail-in rebate).

Can OfficeMax conclude that those who buy the fax/copier outspend those who buy the package of CD-ROMs? Write a brief memo to the executives of OfficeMax describing your findings and any possible recommendations.