Question: Control charts for mean and range are maintained for an important quality characteristic. After thirty five samples of sizes seven were collected, it was

Control charts for mean and range are maintained for an important quality

Control charts for mean and range are maintained for an important quality characteristic. After thirty five samples of sizes seven were collected, it was found that 35 = 7805 i=1 35 Ri = 1200 i=1 3.1 Set up the control limits for the mean chart. [9] 3.2 From your answers in Question 3.1, when will the process need any adjustments? Clearly motivate your answer. [5] 3.3 Assuming the quality characteristic follows a normal distribution with a specification of 22035, estimate the capability of the process. What are your conclusions? [10]

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