Computer upgrades have a nominal time of 80 minutes. Samples of five 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, and decide if the process is in control. (step-by-step solution) SAMPLE 1 2 3 4 5 6 79.2 80.5 79.6 78.9 80.5 79.7 78.8 78.7 79.6 79.4 79.6 80.6 80.0 81.0 79.7 79.7 80.4 80.5 78.4 80.4 79.4 79.4 80.8 80.0 81.0 80.1 80.6 80.6 78.8 81.1

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Computer upgrades have a nominal time of 80 minutes. Samples of five 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, and decide if the process is in control. (step-by-step solution)

SAMPLE

1 2 3 4 5 6
79.2 80.5 79.6 78.9 80.5 79.7
78.8 78.7 79.6 79.4 79.6 80.6
80.0 81.0 79.7 79.7 80.4 80.5
78.4 80.4 79.4 79.4 80.8 80.0
81.0 80.1 80.6 80.6 78.8 81.1

 

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