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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
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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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
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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