Question

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 deviation.
(b) Construct a tabular CUSUM for this process, using standardized values h= 5 and k = ½. Interpret this chart.


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  • CreatedNovember 06, 2015
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