Question: A quality-control apprentice is preparing a CUSUM chart. The values calculated for SL and SH are presented in the following table. Three of the values

A quality-control apprentice is preparing a CUSUM chart. The values calculated for SL and SH are presented in the following table. Three of the values have been calculated incorrectly. Which are they?

Previous results suggest that a value of ???? = 15 is reasonable for this process.

a. Using the value 1500 for the target mean ????, and the values k = 0.5 and h = 4, construct a CUSUM chart.

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

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