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A total of 300 observations of Bob Ramos, anassembly-line worker, were made over a 40-hour workweek. Thesample also showed that Bob was busy working (assembling theparts) during 250 observations.a) Find the percentage of time Bob was working. b) If you want a confidence level of 95%, and if {3% is an accept-able error, what size should the sample be? c) Was the sample size adequate?

A total of 300 observations of Bob Ramos, anassembly-line worker, were made over a 40-hour workweek. Thesample also showed that Bob was busy working (assembling theparts) during 250 observations.a) Find the percentage of time Bob was working. b) If you want a confidence level of 95%, and if {3% is an accept-able error, what size should the sample be? c) Was the sample size adequate?

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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A total of 300 observations of Bob Ramos, an
assembly-line worker, were made over a 40-hour workweek. The
sample also showed that Bob was busy working (assembling the
parts) during 250 observations.
a) Find the percentage of time Bob was working.

b) If you want a confidence level of 95%, and if {3% is an accept-
able error, what size should the sample be?

c) Was the sample size adequate?

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