Question: Question 3 [24] Control charts for mean and range are maintained for an important quality characteristic. After thirty five samples of sizes seven were collected,

Question 3 [24] Control charts for mean and range

Question 3 [24] 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 X, = 7805 35 R. = 1200 3.1 3.2 Set up the control limits for the mean chart (9) From your answers in Question 3.1, when will the process need any adjustments? Clearly motivate your answer. [5] Assuming the quality characteristic follows a normal distribution with a specification of 220+35, estimate the capability of the process. What are your conclusions? [10] 3.3

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