# Production mgmt homework assignment | Operations Management homework help

Details of Assignment (W4): Complete problems 6.12, S6.11, S6.20, S6.23, S6.27, and S6.35 in the textbook.Submit one Excel file. Put each problem result on a separate sheet in your file.

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S6.11Twelve 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:

 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 9.999 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

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 why not?

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