Question: Refer to Exercise 3. a. Delete any samples necessary to bring the process variation under control. (You did this already if you did Exercise 3.)

Refer to Exercise 3.

a. Delete any samples necessary to bring the process variation under control. (You did this already if you did Exercise 3.)

b. Use R to estimate ????X (????X is the difference between X and the 1???? control limit on an X chart).

c. Construct a CUSUM chart, using X for the target mean ????, and the estimate of ????X found in part

(b) for the standard deviation. Use the values k = 0.5 and h = 4.

d. Is the process mean in control? If not, when is it first detected to be out of control?

e. Construct an X chart, and use the Western Electric rules to determine whether the process mean is in control. (You did this already if you did Exercise 3.)

Do the Western Electric rules give the same results as the CUSUM chart? If not, how are they different?

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