At Quick Car Wash, the wash process is advertised to take less than 7 minutes. Consequently, management has set a target average of 390 seconds for the wash process. Suppose the average range for a sample of 9 cars is 8 seconds. Use the accompanying table to establish control limits for sample means and ranges for the car wash process. LOADING... Click the icon to view the table of factors for calculating three-sigma limits for the x overbarx-chart and R-chart. Factors for calculating three-sigma limits for the x overbarx-chart and R-chart Size of Sample (n) Factor for UCL and LCL for x overbarx-chart (Upper A 2A2) Factor for LCL for R-Chart (Upper D 3D3) Factor for UCL for R-Chart (Upper D 4D4) 2 1.8801.880 00 3.2673.267 3 1.0231.023 00 2.5752.575 4 0.7290.729 00 2.2822.282 5 0.5770.577 00 2.1152.115 6 0.4830.483 00 2.0042.004 7 0.4190.419 0.0760.076 1.9241.924 8 0.3730.373 0.1360.136 1.8641.864 9 0.3370.337 0.1840.184 1.8161.816 10 0.3080.308 0.2230.223 1.7771.777 Part 2 The UCL Subscript Upper RUCLR equals seconds and the LCL Subscript Upper RLCLR equals seconds. (Enter your responses rounded to two decimal places.)

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

minutes. Consequently, management has set a target average of

390

seconds for the wash process. Suppose the average range for a sample of

cars is

seconds. Use the accompanying table to establish control limits for sample means and ranges for the car wash process.

Click the icon to view the table of factors for calculating three-sigma limits for the

x overbarx-chart

and R-chart.

Factors for calculating three-sigma limits for the

x overbarx-chart

and R-chart

Size of Sample (n)	Factor for UCL and LCL for x overbarx-chart (Upper A 2A2)	Factor for LCL for R-Chart (Upper D 3D3)	Factor for UCL for R-Chart (Upper D 4D4)
2	1.8801.880	00	3.2673.267
3	1.0231.023	00	2.5752.575
4	0.7290.729	00	2.2822.282
5	0.5770.577	00	2.1152.115
6	0.4830.483	00	2.0042.004
7	0.4190.419	0.0760.076	1.9241.924
8	0.3730.373	0.1360.136	1.8641.864
9	0.3370.337	0.1840.184	1.8161.816
10	0.3080.308	0.2230.223	1.7771.777

Part 2

The

UCL Subscript Upper RUCLR

equals

seconds and the

LCL Subscript Upper RLCLR

equals

seconds. (Enter your responses rounded to two decimal places.)

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