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Is there evidence of this in the data

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Reference no: EM131060289

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

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

Reference no: EM131060289

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