Draw charts and plot values of the sample means and ranges

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Reference no: EM1374176

Q. Sample Sample Mean (in.) Range (in.)
1 10.002 0.011
2 10.002 0.014
3 9.991 0.007
4 10.006 0.022
5 9.997 0.013
6 9.997 0.012
7 10.001 0.008
8 10.005 0.013
9 9.995 0.004
10 10.001 0.011
11 10.001 0.014
12 10.006 0.009

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: EM1374176

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