The manager of the customer service department of Omega 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. Based on the data, what can you tell the manager about the performance of the billing process? Do you see any non random behavior in the hilling process? If so, what might cause this behavior?

Sample data for omega credit card service

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TABLE 5.5 SAMPLE DATA FOR OMEGA CREDIT CARD SERVICE Samples Number of Errors in Sample of 250 1-10496 12 82 13 9 11-20 468 012 43 10 14 21-3013117 3 211 6 9 5