Question: Consider the control chart based on control limits 02.81 /n. a. What is the ARL when the process is in control? b. What is the

Consider the control chart based on control limits µ0±2.81 σ/√n.
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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