Discuss and illustrate out the employ of statistical process control in quality management.
Make distinction between common causes and assignable causes of variation. Support your answer by proper illustrations.
A manufacturer of electric light bulbs is concerned that the process is becoming unmanageable. The manager has taken one sample a day for the last ten days, with 100 bulbs in each sample. The results are shown below. Draw a control chart with 3-sigma control and comment on process.
A popular restaurant has been losing customers and orders because of numerous delays and errors. The Restaurant Manager wants to recognize problems and causes which might be contributing to customer dissatisfaction.
Discuss and illustrate how the manager would apply quality tools and techniques to diminish errors and increase customer satisfaction. Use appropriate diagrams to support your answer.