Question: Consider the hub data in Exercise 15-95. (a) Construct an EWMA control chart with Î» = 0.2 and L = 3. Comment on process control.

Consider the hub data in Exercise 15-95.

(a) Construct an EWMA control chart with Î» = 0.2 and L = 3. Comment on process control.

(b) Construct an EWMA control chart with Î» = 0.5 and L = 3 and compare your conclusion to part (a).

Exercise 15-95

An article in Quality Engineering [€œIs the Process Capable? Tables and Graphs in Assessing C_pm€ (1992, Vol. 4(4)]. Considered manufacturing data. Specifications for the outer diameter of the hubs were 60.3265 ± 0.001 mm. A random sample with size n = 20 was taken and the data are shown in the following table:

Sample Sample 60.3262 11 60.3262 60.3262 12 60.3262 60.3269 3 60.3262 13 4 60.3266 14 60.3261 5 60.3263 15 60.3265 60.32

Sample Sample 60.3262 11 60.3262 60.3262 12 60.3262 60.3269 3 60.3262 13 4 60.3266 14 60.3261 5 60.3263 15 60.3265 60.3260 16 60.3266 60.3262 17 60.3265 60.3267 18 60.3268 60.3263 19 60.3262 60.3266 10 60.3269 20

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