The Xecko Film Company manufactures color photographic film. The film is produced in large rolls of various lengths before it is cut and packaged as the smaller roles purchased in retail stores. The company wants to monitor the quality of these rolls of film using a c-chart. Twentyfour rolls have been inspected at random, and the numbers of defects per roll are as follows:
Roll Number of Defects 1 12 2 8 3 5 4 7 5 14 6 9 7 10 8 11 9 8 10 6 11 15 12 10 13 12 14 13 15 9 16 8 17 7 18 11 19 9 20 13 21 17 22 16 23 12 24 14
Construct a c-chart with 2σ limits for this process and indicate if the process was out of control at any time.
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| Roll | Number of Defects |
| 1 | 12 |
| 2 | 8 |
| 3 | 5 |
| 4 | 7 |
| 5 | 14 |
| 6 | 9 |
| 7 | 10 |
| 8 | 11 |
| 9 | 8 |
| 10 | 6 |
| 11 | 15 |
| 12 | 10 |
| 13 | 12 |
| 14 | 13 |
| 15 | 9 |
| 16 | 8 |
| 17 | 7 |
| 18 | 11 |
| 19 | 9 |
| 20 | 13 |
| 21 | 17 |
| 22 | 16 |
| 23 | 12 |
| 24 | 14 |
Construct a c-chart with 2σ limits for this process and indicate if the process was out of control at any time.
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