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At Quick Car​ Wash, the wash process is advertised to take less than 6 minutes.​ Consequently, management has set a target average of 320 seconds for the wash process. Suppose the average range for a sample of 10 cars is 10 seconds. Use the accompanying table to establish control limits for sample means and ranges for the car wash process.

At Quick Car​ Wash, the wash process is advertised to take less than 6 minutes.​ Consequently, management has set a target average of 320 seconds for the wash process. Suppose the average range for a sample of 10 cars is 10 seconds. Use the accompanying table to establish control limits for sample means and ranges for the car wash process.

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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At Quick Car​ Wash, the wash process is advertised to take less than 6 minutes.​ Consequently, management has set a target average of 320 seconds for the wash process. Suppose the average range for a sample of 10 cars is 10 seconds. Use the accompanying table to establish control limits for sample means and ranges for the car wash process.

1 2 3 4 5 6 7 Ź Click the icon The UCLR equals The UCL equals More Info Factors for calculating three-sigma limits for the x-chart and R-chart Factor for LCL for R-Chart (D3) Size of Sample Factor for UCL and LCL for x-chart (A₂) (n) 2 3 4 5 6 7 8 9 10 1.880 1.023 0.729 0.577 0.483 0.419 0.373 0.337 0.308 Print 0 0 0 0 0 0.076 0.136 0.184 0.223 Done Factor for UCL for R-Chart (D4) 3.267 2.575 2.282 2.115 2.004 1.924 1.864 1.816 1.777 - X
Transcribed Image Text:1 2 3 4 5 6 7 Ź Click the icon The UCLR equals The UCL equals More Info Factors for calculating three-sigma limits for the x-chart and R-chart Factor for LCL for R-Chart (D3) Size of Sample Factor for UCL and LCL for x-chart (A₂) (n) 2 3 4 5 6 7 8 9 10 1.880 1.023 0.729 0.577 0.483 0.419 0.373 0.337 0.308 Print 0 0 0 0 0 0.076 0.136 0.184 0.223 Done Factor for UCL for R-Chart (D4) 3.267 2.575 2.282 2.115 2.004 1.924 1.864 1.816 1.777 - X
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