Consider the concentration data in Exercise 15 76 Use 8 and assume that the desired process target is 100 (a) Construct an EWMA control chart with 0 2 Does the process appear to be in control (b) Construct an EWMA control chart with 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 Concentration Batch Concentration Batch 1 104 5 11 95 4 99 9 12 94 5 106 7 3 13 104 5 4 105 2 14 99 7 97 7 94 8 15 94 6 6 16 97 104 4 17 95 8

Question: Consider the concentration data in Exercise 15-76. Use = 8 and assume that the desired process target is 100. (a) Construct an EWMA control

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).

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:

Concentration Batch Concentration Batch 1 104.5 11 95.4 99.9 12 94.5 106.7

Concentration Batch Concentration Batch 1 104.5 11 95.4 99.9 12 94.5 106.7 3 13 104.5 4 105.2 14 99.7 97.7 94.8 15 94.6 6. 16 97 104.4 17 95.8

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