Twenty successive hardness measurements are made on a
Chapter 15, Problem 157E(choose chapter or problem)
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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