A paper mill uses a control chart to monitor the imperfection in finished rolls of paper. Production output is inspected for twenty days, and the resulting data are shown below. Use these data to set up a control chart to monitor the paper mill process. (a) What type of control chart would you recommend for this case ? (b) What center line and control limits would you recommend for controlling current production?

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Problem 3.
A paper mill uses a control chart to monitor the imperfection in finished rolls of paper.
Production output is inspected for twenty days, and the resulting data are shown below.
Use these data to set up a control chart to monitor the paper mill process.
(a) What type of control chart would you recommend for this case ?
(b) What center line and control limits would you recommend for controlling current
production?
Transcribed Image Text:Problem 3. A paper mill uses a control chart to monitor the imperfection in finished rolls of paper. Production output is inspected for twenty days, and the resulting data are shown below. Use these data to set up a control chart to monitor the paper mill process. (a) What type of control chart would you recommend for this case ? (b) What center line and control limits would you recommend for controlling current production?
Data on Imperfections in Rolls of Paper
Total
Total
Number Number of
Number Number of
Imper-
Day Produced fections
of Rolls
of Rolls
Imper-
Day Produced fections
18
12
11
18
18
18
14
12
18
14
24
20
13
18
9.
22
18
14
20
10
22
15
15
20
14
22
12
16
20
13
7
20
11
17
24
16
8
20
15
18
24
18
9
20
12
19
22
20
10
20
10
20
21
17
123 +5
Transcribed Image Text:Data on Imperfections in Rolls of Paper Total Total Number Number of Number Number of Imper- Day Produced fections of Rolls of Rolls Imper- Day Produced fections 18 12 11 18 18 18 14 12 18 14 24 20 13 18 9. 22 18 14 20 10 22 15 15 20 14 22 12 16 20 13 7 20 11 17 24 16 8 20 15 18 24 18 9 20 12 19 22 20 10 20 10 20 21 17 123 +5
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