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?