Consider the diameter data in Exercise 15 75 Assume that the desired process target is 10 0 millimeters (a) Estimate the process standard deviation (b) Construct an EWMA control chart with Icirc raquo 0 2 Does the process appear to be in control (c) Construct an EWMA control chart with Icirc raquo 0 5 Compare your results to part (a) Exercise 15 75 An automatic senson measures the diameter of holes in consecutive order The results of measuring 25 holes follow Sample Diameter Sample Diameter 1 9 94 14 9 99 9 93 15 10 12 3 10 09 16 9 81 9 98 9 73 17 5 10 11 18 10 14 6 9 99 19 9 96 10 11 20 10 06 8 9 84 21 10 11 9 9 82 22 9 95 10 10 38 23 9 92 11 9 99 24 10 09 12 10 41 25 9 85 13 10 36

Question: Consider the diameter data in Exercise 15-75. Assume that the desired process target is 10.0 millimeters. (a) Estimate the process standard deviation. (b) Construct an

Consider the diameter data in Exercise 15-75. Assume that the desired process target is 10.0 millimeters.

(a) Estimate the process standard deviation.

(b) Construct an EWMA control chart with Î» = 0.2. Does the process appear to be in control?

Exercise 15-75

An automatic senson measures the diameter of holes in consecutive order. The results of measuring 25 holes follow.

Sample Diameter Sample Diameter 1 9.94 14 9.99 9.93 15 10.12 3 10.09 16 9.81 9.98 9.73 17 5 10.11 18 10.14 6. 9.99 19 9.

Sample Diameter Sample Diameter 1 9.94 14 9.99 9.93 15 10.12 3 10.09 16 9.81 9.98 9.73 17 5 10.11 18 10.14 6. 9.99 19 9.96 10.11 20 10.06 8. 9.84 21 10.11 9. 9.82 22 9.95 10 10.38 23 9.92 11 9.99 24 10.09 12 10.41 25 9.85 13 10.36

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