Answered: SAMPLE SAMPLE MEAN (in.) RANGE (in.)…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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Question

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: 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?

SAMPLE
SAMPLE MEAN (in.)
RANGE (in.)
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
9.995
0.004
10
10.001
0.011
11
10.001
0.014
12
10.006
0.009

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