An automatic sensor measures the diameter of holes in
Chapter 15, Problem 159E(choose chapter or problem)
An automatic sensor measures the diameter of holes in consecutive order. The results of measuring 25 holes are in the following table.
(a) Using all the data, compute trial control limits for individual observations and moving-range charts. Construct the control 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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