Day Number Incorrect Bills Day Number Incorrect Bills Day Numbe

Day

Number Incorrect Bills

Day

Number Incorrect Bills

Day

Number Incorrect Bills

1

2

11

1

21

1

2

2

12

2

22

3

3

1

13

3

23

3

4

2

14

3

24

4

5

2

15

2

25

5

6

3

16

3

26

5

7

2

17

2

27

6

8

2

18

2

28

5

9

1

19

1

29

5

10

2

20

3

30

5

***my professor gave this homework assignment to me for extra credit but never told us how to set up a three-sigma.. any help would be greatly appreciated

Case Questions

1. Set up three-sigma control limits with the given data.

2. Is the process in control? Why?

3. Based on your analysis do you think the problem is the new computer system or something else?