Show that if = 2/(w + 1) for the EWMA control chart, then this chart is equivalent to a w-period moving average control chart in the sense that the control limits are identical in the steady state.
Answer to relevant QuestionsA machine is used to fill cans with motor oil additive. A single sample can is obtained. Since the filling process is automated, it has very stable variability, and long experience indicates that σ = 0.05 oz. The individual ...Consider the valve failure data in Example 7.6. Set up a CUSUM chart for monitoring the time between events using the transformed variable approach illustrated in that example. Use standardized values of h = 5 and k = ½. Bath concentrations are measured hourly in a chemical process. Data (in ppm) for the last 32 hours are shown in Table 9E.4 (read down from left). The process target is µ0 = 175 ppm. (a) Estimate the process standard ...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 ...Set up a moving center line EWMA control chart for the concentration data in Exercise 10.20. Compare it to the residuals control chart in Exercise 10.20, part (c). To find the optimal , fit an ARIMA (0,1,1) (= EWMA = ...
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