A process considered to be in control measures an ingredient in ounces. A quality inspector took 10 samples, each with 5 observations as follows: Observations Samples 1 2. 3 4 1 10 9. 10 9. 12 11 11 10 3\ 13 9. 10 10 4. 10 10 11 10 10 5. 12 10 9. 11 10 6. 10 10 8 12 7. 10 11 10 8 9. 8. 13 10 8 10 8 6. 8 8. 12 12 9 10 10 12 8. 12 a) Using this information, obtain three-sigma (i.e., z=3) control limits for a mean control chart and control limits for a range chart, respectively. It is known from previous experience that the standard deviation of the process is 1.36. b) Discuss whether the process is in control or not.
A process considered to be in control measures an ingredient in ounces. A quality inspector took 10 samples, each with 5 observations as follows: Observations Samples 1 2. 3 4 1 10 9. 10 9. 12 11 11 10 3\ 13 9. 10 10 4. 10 10 11 10 10 5. 12 10 9. 11 10 6. 10 10 8 12 7. 10 11 10 8 9. 8. 13 10 8 10 8 6. 8 8. 12 12 9 10 10 12 8. 12 a) Using this information, obtain three-sigma (i.e., z=3) control limits for a mean control chart and control limits for a range chart, respectively. It is known from previous experience that the standard deviation of the process is 1.36. b) Discuss whether the process is in control or not.
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ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
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Transcribed Image Text:A process considered to be in control measures an ingredient in ounces. A quality inspector took 10
samples, each with 5 observations as follows:
Observations
Samples
3
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9.
10
12
9.
11
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3.
13
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4.
10
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10
5.
12
10
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10
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10
8
12
9.
10
11
10
8.
9
8.
13
10
8
10
8.
6.
8.
8,
12
12
6.
10
10
12
9.
8
12
a) Using this information, obtain three-sigma (i.e., z=3) control limits for a mean control chart and
control limits for a range chart, respectively. It is known from previous experience that the standard
deviation of the process is 1.36.
b) Discuss whether the process is in control or not.
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