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 October 24, 2018, 11:02 pm ad1c9bdddf
The solution answers the question below.
Statistics: Construct the 3-sigma x-chart and the 3-sigma R-chart for auto pistons
Auto pistons at Yongpin Zhou's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows:
Day Mean(mm) Range(mm)
1 156.9 4.2
2 153.2 4.6
3 153.6 4.1
4 155.5 5.0
5 156.6 4.5
Construct the 3-sigma x-chart and the 3-sigma R-shart for this dimension, using the data observed in the table above.View Full Posting Details