Problem 8.29 The number of imperfections in bond paper produced by a paper mill is observed over a period of several days. Table 8-28 shows the area inspected and the number of imperfections for 25 samples. Construct a control chart for the number of imperfections per square meter. Revise the limits, if necessary, assuming special causes for the out-of-control points.

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4. Problem 8.29 The number of imperfections in bond paper produced by a paper mill is
observed over a period of several days. Table 8-28 shows the area inspected and the
number of imperfections for 25 samples. Construct a control chart for the number of
imperfections per square meter. Revise the limits, if necessary, assuming special causes for
the out-of-control points.
TABLE 8-28
Area
Area
Sample
Inspected (m?)
Imperfections
Sample
Inspected (m²)
Imperfections
1
150
6
14
300
8
2
100
8
15
300
12
3
200
5
16
200
6
4
150
4
17
150
4
250
10
18
200
7
6.
100
11
19
150
14
7
150
20
100
4
8
200
5
21
100
8
9
300
10
22
200
10
250
10
23
300
12
11
100
24
250
7
12
200
4
25
200
5
13
250
12
Transcribed Image Text:4. Problem 8.29 The number of imperfections in bond paper produced by a paper mill is observed over a period of several days. Table 8-28 shows the area inspected and the number of imperfections for 25 samples. Construct a control chart for the number of imperfections per square meter. Revise the limits, if necessary, assuming special causes for the out-of-control points. TABLE 8-28 Area Area Sample Inspected (m?) Imperfections Sample Inspected (m²) Imperfections 1 150 6 14 300 8 2 100 8 15 300 12 3 200 5 16 200 6 4 150 4 17 150 4 250 10 18 200 7 6. 100 11 19 150 14 7 150 20 100 4 8 200 5 21 100 8 9 300 10 22 200 10 250 10 23 300 12 11 100 24 250 7 12 200 4 25 200 5 13 250 12
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