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 the table below:
The Manager Of The Customer Service Department Of Data Tech Credit Card Service Company Is Concerned About The Number Of 1 (94.92 KiB) Viewed 29 times
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 the table below: 1 Number of Errors in Sample of 250 Samples 1-10 11-20 9 13 4 12 9 6 2 1 7 10 5 8 5 2 8 5 10 7 1 12 21-30 9 0 8 3 6 7 9 11 3 3 a. Construct a p-chart for the billing process. Set up the p-chart by specifying its control limits and center line. (Enter your responses rounded to four decimal places. If your answer for LCLp is negative, enter this value as 0.) UCLp = p= LCLp = b. Is there any nonrandom behavior in the billing process that would require management attention? O A. Yes, and management would like to repeat whatever was done when samples 24 - 28 were taken and to avoid what was done during samples 4-8. O B. Since all of the data points are within the control limits then, by definition, there is not any nonrandom behavior in the billing process. OC. Yes-samples 24 - 28 have an upward run and samples 4-8 have a downward run. O D. There are not enough samples to determine whether there is any nonrandom behavior in the billing process.
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