Problem

Consider the control chart based on control limits a. What is the ARL when the process...

Consider the control chart based on control limits

a. What is the ARL when the process is in control?

b. What is the ARL when n = 4 and the process mean has shifted to μ = μ0 + σ ?

c. How do the values of parts (a) and (b) compare to the corresponding values for a 3-sigma chart?

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