Question: Question 3 (a) After constructing the R-chart, the mean has shifted to a value li > Ho even the process variability remains unchanged and under

Question 3 (a) After constructing the R-chart,

Question 3 (a) After constructing the R-chart, the mean has shifted to a value li > Ho even the process variability remains unchanged and under control. Use a diagram to illustrate and explain the above phenomenon; and suggest the necessary steps to improve the above problem. [7 marks) (b) Distinguish between Single Sampling Plan and Double Sampling Plan. Which plan is more appropriate to inspect the products for the Lunar New Year Fair. Why? [7 marks] (C) What are the THREE major advantages of statistical process control? [6 marks]

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