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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?
(b) Set up a t chart for the total number of errors, assuming a geometric distribution with a = 1. Is the process in control?
(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
11
17
2
9
3
5
4
13
6
10
15
12
14
16
18
19
20
21
22
23
24
25
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