A paper mill uses a control chart to monitor the imperfections in finished rolls of paper. Production output is inspected for twenty days, and the resulting data are shown below. Set up a control chart for nonconformities per roll of paper. Remove any out of control points, and re-calculate the control limits and center line. Provide the final control chart center line and limits below. Show your equations
Day | Number of Rolls Produced | Total Number of Imperfections | Day | Number of Rolls Produced | Total Number of Imperfections |
1 | 18 | 12 | 11 | 18 | 18 |
2 | 18 | 14 | 12 | 18 | 14 |
3 | 24 | 20 | 13 | 19 | 8 |
4 | 22 | 18 | 14 | 20 | 10 |
5 | 22 | 15 | 15 | 20 | 14 |
6 | 22 | 12 | 16 | 20 | 13 |
7 | 20 | 11 | 17 | 24 | 16 |
8 | 20 | 13 | 18 | 24 | 18 |
9 | 20 | 12 | 19 | 22 | 20 |
10 | 20 | 10 | 20 | 21 | 17
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