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The inner-diameter of piston rings follows a normal distribution with mean = 75 mm, and variance = 9. a) construct a Xbar Shewhart control chart

The inner-diameter of piston rings follows a normal distribution with mean = 75 mm, and variance = 9.

a) construct a Xbar Shewhart control chart with n=16 and k=3.

b) If the mean of process changes to 78 mm, calculate theType II error

c) What is the probability of detecting the change beforeplotting the 4th sample.

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