Calcium hardness is measured hourly for a public swimming pool. Data (in ppm) for the last 32

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Calcium hardness is measured hourly for a public swimming pool. Data (in ppm) for the last 32 hours are shown in Table 5E.13 (read down from left). The process target is = 175 ppm.

a. Estimate the process standard deviation.

b. Construct a CUSUM chart for this process using standardized values of h = 5 and k = 1/2.

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Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund

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Question Posted: Sep 19, 2015 04:41 AM

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Calcium hardness is measured hourly for a public swimming pool. Data (in ppm) for the last 32

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