A&A Enterprises ships integrated circuits to companies that assemble computers. Because computer manufacturing operations run on little inventory, parts must be available when promised. Thus, a critical element of A&A's customer satisfaction is on-time delivery performance. To ensure that their delivery process is performing as intended, a quality improvement team decided to monitor the firm's distribution and delivery process. From the A&A corporate data base, 100 monthly shipping records were randomly selected for the previous 21 months, and the number of on-time shipments was counted.
Month On Time
Develop the appropriate 3-sigma control chart(s) for monitoring this process. Does it appear that the delivery process is in control? If not, can you suggest some possible assignable causes?© BrainMass Inc. brainmass.com September 22, 2018, 5:13 pm ad1c9bdddf - https://brainmass.com/statistics/control-chart/3-sigma-control-chart-179113
The solution answers the question below.