Answered: Number of Number of Sample Defectives…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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Question

The Commonwealth Banking Corporation issues a national

credit card through its various bank branches in five southeast-
ern states. The bank credit card business is highly competitive

and interest rates do not vary substantially, so the company

decided to attempt to retain its customers by improving cus-
tomer service through a reduction in billing errors. The credit

card division monitored its billing department process by tak-
ing daily samples of 200 customer bills for 30 days and

checking their accuracy. The sample results are as follows:Develop a p-chart for the billing process using 3 control
limits and indicate if the process is out of control.

Number of
Number of
Sample
Defectives
Sample
Defectives
7
10
22
9
8
11
23
10
9
14
24
12
10
10
25
15
11
9
26
14
12
6
27
16
13
3
28
12
14
2
29
15
15
8
30
14

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