Statistical Quality Control: Answer discussion questions 1-4 from chapter 13: 1. The capability index allows from some drifting of the process mean. Discuss what this means in terms of product quality output. 2. In an agreement between a supplier and a customer, the supplier must ensure that all parts are within specification before shipment to the customer. What is the effect on the cost of quality to the customer? 3. In the situation described in question 2 , what would be the effect on the cost of quality to the supplier? 4. Discuss the purposes of and differences between p-charts and X-bar charts, and R-charts