Control Limits for mean and range charts
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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.
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 80.4 79.7 80.4 80.5
78.4 80.4 80.3 79.4 80.8 80.0
81.0 80.1 80.8 80.6 78.8 81.1
Table 10.3
Number of observations
n = 5 A2 = .58 lower control limit D3 = 0 upper control limit D4 = 2.11
Please show all calculations/steps/formulas.
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Solution Summary
Prepares control limits for mean and range charts.
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