Question

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 x-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 whynot?


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  • CreatedJuly 23, 2013
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