Question: Set up an appropriate EWMA control chart for the valve
Set up an appropriate EWMA control chart for the valve failure data in Example 7.6. Use the transformed variable approach illustrated in that example.
Answer to relevant QuestionsDiscuss how you could set up one-sided EWMA control charts. Viscosity measurements on a polymer are made every 10 minutes by an on-line viscometer. Thirty-six observations are shown in Table 9E.5 (read down from left). The target viscosity for this process is µ0 = 3,200. (a) ...A normally distributed quality characteristic is controlled by x and R charts having the following parameters (n = 4, both charts are in control): (a) What is the estimated standard deviation of the quality characteristic ...Consider the concentration data in Exercise 10.20. Construct a EWMA chart on the residuals from the model you fit in part (c) of that exercise. An chart is sued to maintain current control of a process. A single assignable cause of magnitude 2σ occurs, and the time that the process remains in control is an exponential random variable with mean 100 hr. Suppose ...
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