8.10 Rates versus counts. Customers returned 40 cell phones to Verizon this spring, and only 15 to Best Buy next door. Verizon sold 800 cell phones this spring, while Best Buy sold 200.
(a) Verizon had a greater number of cell phones returned. Why does this not show that Verizon’s cell phone customers were less satisfied than those of Best Buy?
(b) What is the rate of returns (percentage of cell phones returned) at each of the stores?
(c) Use the rates of returns that you calculated to explain to a friend which store you would suggest your friend go to to purchase a cell phone.