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.

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TABLE 7.14 Time Between Failure Data, Example 7.6 Time Between Failures, y (hr) 286 948 536 124 816 Transformed Value of Time Between Failures, x = y Failure 4.80986 .70903 5.72650 3.31367 6.43541 2 6 1.46958 3.96768 5.39007 138151 9.09619 5.89774 3.38833 4.5 1 095 5,91690 5.59189 7.16124 7.18601 9.09083 3.55203 143 431 10 12 13 14 15 16 17 18 19 20 2.837 596 81 227 603 492 1.199 1.214 2.831 96