Question: An EWMA chart with = 0.5 and L = 3.07 is to be used to monitor a process. Suppose that the process mean is

An EWMA chart with λ = 0.5 and L = 3.07 is to be used to monitor a process. Suppose that the process mean is μ0 = 10 and σ = 2.

(a) Assume that n = 1. What is the ARL without any shift in the process mean? What is the ARL to detect a shift to μ = 12.

(b) Assume that n = 4. 

Repeat part (a) and comment on your conclusions.

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