Answered: The time needed for checking in at a…

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 checking in at a hotel is to be investigated. Historically, the process has had a
standard deviation equal to .146. The means of 39 samples of n = 14 are
Sample Mean Sample Mean Sample Mean Sample Mean
1 3.86 11 3.88 21 3.84 31 3.88
2 3.90 12 3.86 22 3.82 32 3.76
3 3.83 13 3.88 23 3.89 33 3.83
4 3.81 14 3.81 24 3.86 34 3.77
5 3.84 15 3.83 25 3.88 35 3.86
6 3.83 16 3.86 26 3.90 36 3.80
7 3.87 17 3.82 27 3.81 37 3.84
8 3.88 18 3.86 28 3.86 38 3.79
9 3.84 19 3.84 29 3.98 39 3.85
10 3.80 20 3.87 30 3.96
a. Construct an x¯ -chart for this process with three-sigma limits. Is the process in control?
b. Analyze the data using a median run test and an up/down run test. What can you conclude?

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