Question: Since the implementation of an SPC program in the foundry department in January 1990, the engineers had made one change in the foundry operations, which

Since the implementation of an SPC program in the foundry department in January 1990, the engineers had made one change in the foundry operations, which appear to have resulted in a 4% eduction in the scrap rate from the 1989 average rate of 28% (the standard deviation was 2%)." The table summarizes the weekly scrap rate data for the first half of 1990. Xi Xi 26.4 22.7 25.3 20.4 31.8 19.5 JOVAWN- 27.1 11 21.7 28.5 12 24 20.2 13 22.6 19.3 (a) Construct a CUSUM chart to analyze the data for the purpose of verifying the engineer's claim regarding the scrap reduction. (h =5 and k =0.25). (b) When is the process last in control? (c) What is the magnitude of the mean shift?

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