a. Construct an A -chart for this process with Two Sigma limits. (Round the final answers to 2 decimal places.) Control Limits b. Is the process in control? O Yes O No UCL LCL
a. Construct an A -chart for this process with Two Sigma limits. (Round the final answers to 2 decimal places.) Control Limits b. Is the process in control? O Yes O No UCL LCL
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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Transcribed Image Text:The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation
equal to 162 minute. The means (in minutes) of 39 samples of n = 6 are:
Sample Mean Sample Mean Sample
1
3.79
14
3.71
27
3.68
28
3.98
3.88
3.73
3.98
3.93
3.93
3.92
2
3
4
5
6
7
8
9
10
11
12
13
3.78
3.91
3.70
3.69
Control Limits
561699382
17
O Yes
O No
20
22
24
3.70
3.81
3.77
3.88
3.80
3.82
3.82
3.70
3.74
3.79
3.70
3.79
b. Is the process in control?
223
UCL
29
30
31
mr
32
33
34
35
36
1399
37
38
a. Construct an
H
-chart for this process with Two Sigma limits. (Round the final answers to 2 decimal places.)
39
Mean
3.83
3.85
3.83
3.59
3.70
3.70
3.59
3.89
3.85
3.89
3.77
3.76
3.69
LCL
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