Question: Each hour, a 10 m 2 section of fabric is inspected for flaws. The numbers of flaws observed for the last 20 hours are as

Each hour, a 10 m2section of fabric is inspected for flaws. The numbers of flaws observed for the last 20 hours are as follows:

38 35 35 49 33 48 40 47 45 46 41 53

a. Compute the upper and lower 3σ limits for a c chart.

b. Is the process in control? If not, when is it first detected to be out of control?

38 35 35 49 33 48 40 47 45 46 41 53 36 41 51 63 35 58 55 57

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