Decide the upper and lower control limits

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Q. Twelve samples, each containing 5 parts, were taken from a process that produces steel rods. The length of each rod in the samples was decided. The results were tabulated and sample means and ranges were computed. The results were:

A) Decide 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 information indicate a process that is in control?

D) Why or why not?

 

Reference no: EM1374174

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