Twenty successive hardness measurements are made on a metal alloy, and the data are shown in the
Question:
Twenty successive hardness measurements are made on a metal alloy, and the data are shown in the following table.
(a) Using all the data, compute trial control limits for individual observations and moving-range charts. Construct the chart and plot the data. Determine whether the process is in statistical control. If not, assume that assignable causes can be found to eliminate these samples and revise the control limits.
(b) Estimate the process mean and standard deviation for the in-control process.
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a There are no points beyond the control limits The process appears to be in control b Estimated ...View the full answer
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Related Book For 
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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