Question: Consider the hardness measurement data in Exercise 15-19. Set up a CUSUM scheme for this process using = 50 and = 2 so

Consider the hardness measurement data in Exercise 15-19. Set up a CUSUM scheme for this process using Î¼ = 50 and Ïƒ = 2 so that K = 1 and H = 10. Is the process in control?

Exercise 15-19

Twenty successive hardness measurements are made on a metal alloy, and the data are shown in the following table.

Hardness Observation 11 12 Observation Hardness 51 51 57 52 3 4

Hardness Observation 11 12 Observation Hardness 51 51 57 52 3 4 58 50 54 55 55 13 14 15 53

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