Answered: Q2) A paper mill uses a control chart…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Q2) A paper mill uses a control chart to monitor the imperfection in finished rolls of paper. Production output is inspected for 20 days, and the resulting data are shown here. Use these data to set up a control chart for nonconformities per roll of paper.

(a) Does the process appear to be in statistical control? What center line and control limits would you recommend for controlling current production?

(b) Set up a u chart based on an average sample size to control this process.

Number Total number
Number
of Rolls
Total number
of Rolls
of
of
Day
Produced Imperfections
Day
Produced Imperfections
1
18
15
11
18
16
18
11
12
18
14
3
24
23
13
18
11
4
22
15
14
20
10
5
22
17
15
20
17
6.
22
10
16
20
10
7
20
10
17
24
16
8
20
13
18
24
18
20
15
19
22
20
10
20
10
20
21
17
2.

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