The manager of the customer service department of Data Tech Credit Card Service Company is concerned about the number of defects produced by the billing process. Every day a random sample of 250 statements was inspected for errors regarding incorrect entries involving account numbers, transactions on the customer’s account, interest charges, and penalty charges. Any statement with one or more of these errors was considered a defect. The study lasted 30 days and yielded the data in Table. Sample Data For Data Tech Credit Card Service Samples Number of Errors in Sample of 250 1–10 3 8 5 11 7 1 12 9 0 8 11–20 3 5 7 9 11 3 2 9 13 4 21–30 12 10 6 2 1 7 10 5 8 4 a. Construct a p-chart for the billing process.b. Is there any nonrandom behavior in the billing process that would require management attention?
The manager of the customer service department of Data Tech Credit Card Service Company is concerned about the number of defects produced by the billing process. Every day a random sample of 250 statements was inspected for errors regarding incorrect entries involving account numbers, transactions on the customer’s account, interest charges, and penalty charges. Any statement with one or more of these errors was considered a defect. The study lasted 30 days and yielded the data in Table. Sample Data For Data Tech Credit Card Service Samples Number of Errors in Sample of 250 1–10 3 8 5 11 7 1 12 9 0 8 11–20 3 5 7 9 11 3 2 9 13 4 21–30 12 10 6 2 1 7 10 5 8 4 a. Construct a p-chart for the billing process.b. Is there any nonrandom behavior in the billing process that would require management attention?
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
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The manager of the customer service department of Data Tech Credit Card Service Company is concerned about the number of defects produced by the billing process. Every day a random sample of 250 statements was inspected for errors regarding incorrect entries involving account numbers, transactions on the customer’s account, interest charges, and penalty charges. Any statement with one or more of these errors was considered a defect. The study lasted 30 days and yielded the data in Table.
Sample Data For Data Tech Credit Card Service | ||||||||||
Samples | Number of Errors in Sample of 250 | |||||||||
1–10 | 3 | 8 | 5 | 11 | 7 | 1 | 12 | 9 | 0 | 8 |
11–20 | 3 | 5 | 7 | 9 | 11 | 3 | 2 | 9 | 13 | 4 |
21–30 | 12 | 10 | 6 | 2 | 1 | 7 | 10 | 5 | 8 | 4 |
a. Construct a p-chart for the billing process.
b. Is there any nonrandom behavior in the billing process that would require management attention?
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