Surface defects have been counted on 25 rectangular steel plates, and the data are shown below. Set up a control chart. Does the process producing the plates appear to be in statistical control?
|
Plate Number
|
Numberof Defects
|
Plate Number
|
Number ofDefects
|
|
1
|
2
|
14
|
10
|
|
2
|
3
|
15
|
2
|
|
3
|
4
|
16
|
2
|
|
4
|
3
|
17
|
6
|
|
5
|
1
|
18
|
5
|
|
6
|
2
|
19
|
4
|
|
7
|
5
|
20
|
6
|
|
8
|
0
|
21
|
3
|
|
9
|
2
|
22
|
7
|
|
10
|
5
|
23
|
0
|
|
11
|
1
|
24
|
2
|
|
12
|
7
|
25
|
4
|
|
13
|
8
|
|
|
|
|
|
|
|
|
|
|
|
|