Draw the charts and plot the values of sample means


Twelve samples, each containing five parts, were taken from a process that produces steel rods. The length of each rod in the samples was determined. The results were tabulated and sample means and ranges were computed. The results were:

A) Determine the upper and lower control limits and the overall means for ? charts and R - Charts.
B) Draw the charts and plot the values of the sample means and ranges.
C) Do the data indicate a process that is in control?
D) Why or why not?

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Operation Management: Draw the charts and plot the values of sample means
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