Statistical control

A paper mill uses a control chart to monitor the imperfection in finished rolls of paper. Production output is inspected for 20 days, and the resulting data are shown in Table 7E.13. a) Use these data to set up a control chart for nonconformities per roll of paper? b) Does the process appear to be in statistical control? c) What center line and control limits would you recommend for controlling current production? d) Set up a u chart based on an average sample size to control this process? e) Find the process capability of the charts?

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