Consider the concentration data in Exercise 15-76. Use = 8 and assume that the desired process
Question:
Consider the concentration data in Exercise 15-76. Use σ = 8 and assume that the desired process target is 100.
(a) Construct an EWMA control chart with λ = 0.2. Does the process appear to be in control?
(b) Construct an EWMA control chart with λ = 0.5. Compare your results to part (a).
(c) If the concentration shifted to 104, would you prefer the chart in part (a) or (b)? Explain.
Exercise 15-76
The concentration of a chemical product is measured by taking four samples from each batch of material. The average concentration of these measurements for the last 20 batches is shown in the following table:
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Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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