Determine the trial central line and control limits for a p-chart using the following data, which are for the payment of dental insurance claims. Plot the values on graph paper and determine if the process is stable. If there are any out-of-control points, assume an assignable cause and determine the revised central line and control limits.
|
Subgroup
Number
|
Number
Inspected
|
Number
Noncom-forming
|
Subgroup
Number
|
Number
Inspected
|
Number
Noncom-forming
|
|
1
2
3
4
5
6
7
8
9
10
11
12
13
|
300
300
300
300
300
300
300
300
300
300
300
300
300
|
3
6
4
6
20
2
6
7
3
0
6
9
5
|
14
15
16
17
18
19
20
21
22
23
24
25
|
300
300
300
300
300
300
300
300
300
300
300
300
|
6
7
4
5
7
5
0
2
3
6
1
8
|