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224 Part IV: Quality Assurance
Continued
14
12
10
Frequency
8
6
4
2
0
A
B
C
Defect type
D
E
Figure 18.11 Bar graph for the data in Example 18.21.
Types of Defects
Part IV.A.4
Frequency
70
60
50
40
30
20
10
100
80
60
40
20
Percent
0 0
Types of defects Corrugation Blistering Streaks Pin holes Dirt Others
Frequency 28 11 10 9 7 5
Percent 40.0 15.7 14.3 12.9 10.0 7.1
Cumulative % 40.0 55.7 70.0 82.9 92.9 100.0
Figure 18.12 Pareto chart for the data in Example 19.1.
the use of his/her resources to eliminate first those defects that affect the quality
of the product most. For instance, the Pareto diagram in Figure 18.12 indicates
that 40 percent of the paper rolls rejected are because of the corrugation problem.
Corrugation and blistering together are responsible for 55.7 percent of the rejected
paper. Corrugation, blistering, and streaks are responsible for 70 percent. Thus,