
Chapter 17
742
FIGURE 17.30
p
control chart
for Example 17.7
produced using
Minitab
Example 17.8
A copper sheet manufacturing company has taken a random sample of 30 sheets of 1 metre
each and examined the number of defects in these plates. The result is displayed in Table 17.15.
Construct a c chart using the data.
TABLE 17.15
Number of defects in a random sample of 30 copper sheets
Copper sheets Defects
1 2
2 3
3 4
4 5
5 2
6 4
7 3
8 2
9 1
10 2
11 3
12 4
13 3
14 2
15 4
16 3
17 2
18 1
19 2
20 3
(Continued)
M17 Buisiness Statistics xxxx 17.indd 742 6/17/2020 11:50:45 AM