Consider the “minute clinic” waiting time data in Exercise 6.66. Set up an EWMA control chart for monitoring this process using = 0.4. Compare this EWMA chart to the one from Exercise 9.16.
Answer to relevant QuestionsApply the scale CUSUM discussed in Section 9.1.8 to the data in Exercise 9.1 Exercise 9.1 Consider the velocity of light data introduced in Exercises 6.69 and 6.70. Use only the 20 observations in Exercise 6.69 to set up a CUSUM with target value 734.5. Plot all 40 observations from both Exercises 6.69 and 6.70 ...(a) Add a headstart feature to the CUSUM in Exercise 9.1. (b) Use a combined Shewhart-CUSUM scheme on the data in Exercise 9.1. Interpret the results of both charts. Show that if the process is in control at the level µ, the exponentially weighted moving average is an unbiased estimator of the process mean. Consider the valve failure data in Example 7.6. Set up a one-sided CUSUM chart for monitoring and detecting an increase in failure rate of the valve. Assume that the target value of the mean time between failures is 700 ...
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