4-6. A company conduct a work sampling study to estimates the proportion of time their workers on idle during the process. The table below shows the data. Observation Times busy Times idle Total period observation Monday Tuesday Wednesday Thursday Friday Total 1 7 7 7 7 9 11 10 32 10 42 (a) What is the estimated percentage of idle time? (Ans. 0.238) (b) Based on the initial results, approximately how many more observations would you require estimating the actual percentage of idle time to within 5% with a confidence of 98%? (Ans. 352 more observations)
4-6. A company conduct a work sampling study to estimates the proportion of time their workers on idle during the process. The table below shows the data. Observation Times busy Times idle Total period observation Monday Tuesday Wednesday Thursday Friday Total 1 7 7 7 7 9 11 10 32 10 42 (a) What is the estimated percentage of idle time? (Ans. 0.238) (b) Based on the initial results, approximately how many more observations would you require estimating the actual percentage of idle time to within 5% with a confidence of 98%? (Ans. 352 more observations)
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:4-6. A company conduct a work sampling study to estimates the proportion of time their
workers on idle during the process. The table below shows the data.
Observation
Times busy
Times idle
Total
period
observation
Monday
Tuesday
Wednesday
Thursday
Friday
Total
1
7
7
7
7
9
11
10
32
10
42
(a) What is the estimated percentage of idle time? (Ans. 0.238)
(b) Based on the initial results, approximately how many more observations would you
require estimating the actual percentage of idle time to within 5% with a confidence
of 98%? (Ans. 352 more observations)
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