For the past ten years, Bill and Margaret have saved money to go to the Super Bowl should their team, the Chicago Bears, reach the finals of the NFC championship. This is the year, and several tour companies offer attractive, but very similar, packages to the game. Since all packages are pretty much the same, they have chosen one that fits their budget. Bill and Margaret are most likely exhibiting

Statistical process control charts: a. indicate to the operator the true quality of material leaving the process. b. display upper and lower limits for process variables or attributes and signal when a process is no longer in control. c. indicate to the process operator the average outgoing quality of each lot. d. display the measurements on every item being produced. e. are a graphic way of classifying problems by their level of importance, often referred to as the 80-20 rule.