1. The manager of Perrotti's Pizza collects data concerning customer complaints about pizza delivery. Either the pizza arrives late, or the wrong pizza is delivered. a. Use a Pareto chart to identify the "vital few" delivery problems. Comment on potential root causes of these problems, and identify any especially egregious quality failures. b. The manager of Perrotti's Pizza is attempting to understand the root causes of late pizza delivery and has asked each driver to keep a log of specific difficulties that create late deliveries. After one week, the logs included the following entries: "delivery vehicle broke down; couldn't make it across town to deliver second pizza in time; couldn't deliver four pizzas to four different customers in time; kitchen was late in producing order; got lost; order ticket was lost in production; couldn't read address on ticket; went to wrong house..." rganize these causes into a cause-and-effect diagram. 3. Regina Fibreboard makes roof liners for the automotive industry. The manufacturing manager is concerned about product quality. She suspects that one particular defect, tears in the fabric, is related to production batch size. An assistant gathers the following data from production records. a. Draw a scatter diagram for these data. a. Draw a scatter diagram for these data. b. Does there appear to be a relationship between batch size and percent defects? What implications does this have for Regina Fibreboard's business? 5. At Conner Company, a custom manufacturer of printed circuit boards, the finished boards are subjected to a final inspection prior to shipment to its customers. As Conner's quality assurance manager, you are responsible for making a presentation to management on quality problems at the beginning of each month. Your assistant has analyzed the reject memos for all the circuit boards that were rejected during the past month. He has given you a summary statement listing the reference number of the circuit board and the reason for rejection from one of the following categories: A = Poor electrolyte coverage B = Improper lamination C= Low copper plating D= Plating separation E= Improper etching For 50 circuit boards that had been rejected last month, the summary statement showed the following: CBCCDECCBADACC B CACDCACCBACACBCCACAACC DACCCECCABAC a. Prepare a tally sheet (or checklist) of the different reasons for rejection. b. Develop a Pareto chart to identify the more significant types of rejection. c. Examine the causes of the most significant type of defect, using a cause-andeffect diagram