Data entry clerks at ARCO key in thousands of insurance recordseach day. They have just completed a new training program and wantto establish a control chart based on the results of this training.Each day random samples of the work of the clerks were collected.The results are shown in the table below. Two hundred records weresampled daily and examined for errors. The number of records witherrors was counted.
Day
Number of Records with Errors
Day
Number of Records with Errors
1
14
11
12
2
10
12
14
3
6
13
10
4
8
14
12
5
10
15
10
6
10
16
12
7
8
17
12
8
8
18
13
9
6
19
11
10
4
20
10
a) You want to set control limits for the proportion of recordswith errors. Assume that the past twenty days performance isadequate for establishing the control limits
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