# 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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**Related Book For**

## Applied Statistics And Probability For Engineers

**ISBN:** 9781118539712

6th Edition

**Authors:** Douglas C. Montgomery, George C. Runger