Question: Consider the purity data in Exercise 15-62. Use and assume that the desired process target is 90. (a) Construct an EWMA control chart with Does

Consider the purity data in Exercise 15-62.

Use and assume that the desired process target is 90.

(a) Construct an EWMA control chart with Does the process appear to be in control?

(b) Construct an EWMA control chart with Compare your results to part (a).

(c) Suppose that the next five observations are 90.75, 90.00, 91.15, 90.95, and 90.86. Apply the EWMAs in part

(a) and

(b) to these new observations. Is there any evidence that the process has shifted out of control?

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