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chp-6 prb 6.12
?????????????? S6.11 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:
SAMPLE SAMPLE MEAN (in.) RANGE (in.)
1Â Â Â Â Â Â Â Â Â Â Â Â Â
10.002Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.011
2Â Â Â Â Â Â Â Â Â Â Â Â Â
10.002Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.014
3Â Â Â Â Â Â Â Â Â Â Â Â
9.991Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.007
4Â Â Â Â Â Â Â Â Â Â Â
10.006Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.022
5Â Â Â Â Â Â Â Â Â
9.997Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.013
6Â Â Â Â Â Â Â Â Â 9.999Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
0.012
7Â Â Â Â Â Â Â Â 10.001Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
0.008
8Â Â Â Â Â Â 10.005Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
0.013
9Â Â Â Â Â Â Â 9.995Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
0.004
10Â Â Â Â 10.001Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.011
11Â Â Â Â 10.001Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.014
12Â Â Â Â Â 10.006Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
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?
Solution
points are less

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chp-6 prb 6-12 --------------S6-11 Twelve samples- each containing fiv.docx

  • 1. chp-6 prb 6.12 ?????????????? S6.11 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: SAMPLE SAMPLE MEAN (in.) RANGE (in.) 1Â Â Â Â Â Â Â Â Â Â Â Â Â 10.002Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.011 2Â Â Â Â Â Â Â Â Â Â Â Â Â 10.002Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.014 3Â Â Â Â Â Â Â Â Â Â Â Â 9.991Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.007 4Â Â Â Â Â Â Â Â Â Â Â 10.006Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.022 5Â Â Â Â Â Â Â Â Â 9.997Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.013 6Â Â Â Â Â Â Â Â Â 9.999Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.012 7Â Â Â Â Â Â Â Â 10.001Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.008 8Â Â Â Â Â Â 10.005Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.013 9Â Â Â Â Â Â Â 9.995Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.004 10Â Â Â Â 10.001Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.011 11Â Â Â Â 10.001Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.014 12Â Â Â Â Â 10.006Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.009
  • 2. 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? Solution points are less