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a-1. After a number of complaints about its directory assistance, a telephone company frequency of wrong numbers given to callers. Each sample consisted of 100 calls. The manager stated that the error rate is about 4 percent. Construct a control chart using 95 percent limits and using P = .04. (Round the final answers to 3 decimal places.) Observation Number of errors Control Limits. 1 5 O Yes O No UCL a-2. Is the process in control? 2 3 3 5 LCL 4 7 5 4 6 6 7 8 8 4 9 5 10 11 9 3 12 4 13 5 14 6 15 6 16 7

a-1. After a number of complaints about its directory assistance, a telephone company frequency of wrong numbers given to callers. Each sample consisted of 100 calls. The manager stated that the error rate is about 4 percent. Construct a control chart using 95 percent limits and using P = .04. (Round the final answers to 3 decimal places.) Observation Number of errors Control Limits. 1 5 O Yes O No UCL a-2. Is the process in control? 2 3 3 5 LCL 4 7 5 4 6 6 7 8 8 4 9 5 10 11 9 3 12 4 13 5 14 6 15 6 16 7

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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a-1. After a number of complaints about its directory assistance, a telephone company examined samples of calls to determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. The manager stated that the error rate is about 4 percent. Construct a control chart using 95 percent limits and using P = .04. (Round the final answers to 3 decimal places.) Observation Number of errors Control Limits 1 5 O Yes No UCL a-2. Is the process in control? 2 3 3 5 LCL 4 7 5 4 6 6 7 8 8 4 9 5 10 11 9 3 12 4 13 5 14 6 15 6 16 7
Transcribed Image Text:a-1. After a number of complaints about its directory assistance, a telephone company examined samples of calls to determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. The manager stated that the error rate is about 4 percent. Construct a control chart using 95 percent limits and using P = .04. (Round the final answers to 3 decimal places.) Observation Number of errors Control Limits 1 5 O Yes No UCL a-2. Is the process in control? 2 3 3 5 LCL 4 7 5 4 6 6 7 8 8 4 9 5 10 11 9 3 12 4 13 5 14 6 15 6 16 7
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