Practical Management Science
Practical Management Science
6th Edition
ISBN: 9781337406659
Author: WINSTON, Wayne L.
Publisher: Cengage,
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Concept explainers

Statistical Process Control
The use of statistical methods to observe and manage a process to make sure that it operates at its full potential and thus produce a confirming product is called Statistical Process Control.
Question
Computer upgrades have a nominal time of 80 minutes. Samples of six observations each have been taken, and the results are as listed. Using factors from Table 10.3, determine upper and lower control limits for mean and range charts. Does the process is in control? Sample 2 3 4 5 73.7 75.0 74.1 73.4 75.0 73.3 73.2 74.1 73.9 74.1 74.5 75.5 74.9 74.2 74.9 72.9 74.9 74.8 73.9 75.3 75.5 74.6 75.3 75.1 73.3 74.2 75.1 75.0 74.5 75.6
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Transcribed Image Text:Computer upgrades have a nominal time of 80 minutes. Samples of six observations each have been taken, and the results are as listed. Using factors from Table 10.3, determine upper and lower control limits for mean and range charts. Does the process is in control? Sample 2 3 4 5 73.7 75.0 74.1 73.4 75.0 73.3 73.2 74.1 73.9 74.1 74.5 75.5 74.9 74.2 74.9 72.9 74.9 74.8 73.9 75.3 75.5 74.6 75.3 75.1 73.3 74.2 75.1 75.0 74.5 75.6
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Calculation of control limits:
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Calculation of control limits:
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X-bar chart:
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R-chart:
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Inference:
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