Telemarketers for a mail-order firm are assigned to make a total of 200 calls each day, then record the number of potential customers who are interested in receiving a catalog and first-order discount coupon in the mail. For each of the past 50 days, the number of catalog/coupon packages sent is as shown here. Construct one or more appropriate control charts and comment on the state of control of the process.
Days Successes
|
Cabinet
Number
|
Number
of Defects
|
Cabinet
Number
|
Number
of Defects
|
|
1
|
4
|
16
|
3
|
|
2
|
3
|
17
|
5
|
|
3
|
2
|
18
|
4
|
|
4
|
3
|
19
|
3
|
|
5
|
3
|
20
|
3
|
|
6
|
2
|
21
|
1
|
|
7
|
2
|
22
|
3
|
|
8
|
3
|
23
|
9
|
|
9
|
3
|
24
|
2
|
|
10
|
4
|
25
|
2
|
|
11
|
6
|
26
|
5
|
|
12
|
1
|
27
|
4
|
|
13
|
4
|
28
|
4
|
|
14
|
2
|
29
|
4
|
|
15
|
1
|
30
|
3
|