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Twelve samples, each containing five parts, were taken from a process that produces steel rods at Emmanuel Kodzi's factory. 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
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
9
9.995
0.004
10
11
12
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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