The data in Table 7E.19 are the number of information errors found in customer records in a marketing company database. Five records were sampled each day.
(a) Set up a c chart for the total number of errors. Is the process in control?
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(c) Discuss the findings from parts (a) and (b). Is the Poisson distribution a good model for the customer error data? Is there evidence of this in the data?
| TABLE 7 E .19 | |||||
| Customer Error Data for Exercise 7.67 | |||||
| Day | Record 1 | Record 2 | Record 3 | Record 4 | Record 5 |
| 1 | 8 | 7 | 1 | 11 | 17 |
| 2 | 11 | 1 | 11 | 2 | 9 |
| 3 | 1 | 1 | 8 | 2 | 5 |
| 4 | 3 | 2 | 5 | 1 | 4 |
| 5 | 3 | 2 | 13 | 6 | 5 |
| 6 | 6 | 3 | 3 | 3 | 1 |
| 7 | 8 | 8 | 2 | 1 | 5 |
| 8 | 4 | 10 | 2 | 6 | 4 |
| 9 | 1 | 6 | 1 | 3 | 2 |
| 10 | 15 | 1 | 3 | 2 | 8 |
| 11 | 1 | 7 | 13 | 5 | 1 |
| 12 | 6 | 7 | 9 | 3 | 1 |
| 13 | 7 | 6 | 3 | 3 | 1 |
| 14 | 2 | 9 | 3 | 8 | 7 |
| 15 | 6 | 14 | 7 | 1 | 8 |
| 16 | 2 | 9 | 4 | 2 | 1 |
| 17 | 11 | 1 | 1 | 3 | 2 |
| 18 | 5 | 5 | 19 | 1 | 3 |
| 19 | 6 | 15 | 5 | 6 | 6 |
| 20 | 2 | 7 | 9 | 2 | 8 |
| 21 | 7 | 5 | 6 | 14 | 10 |
| 22 | 4 | 3 | 8 | 1 | 2 |
| 23 | 4 | 1 | 4 | 20 | 5 |
| 24 | 15 | 2 | 7 | 10 | 17 |
| 25 | 2 | 15 | 3 | 11 | 2 |
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