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Operations Management: Processes and Supply Chains, 12th Edition
book

Operations Management: Processes and Supply Chains, 12th Edition

by Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
January 2018
Intermediate to advanced content levelIntermediate to advanced
480 pages
236h 9m
English
Pearson
Content preview from Operations Management: Processes and Supply Chains, 12th Edition

Solved Problem 2

A library administrator wants to determine the proportion of time the circulation clerk is idle. The following information was gathered randomly by using work sampling:

Day

Number of Times Clerk Busy

Number of Times Clerk Idle

Total Number of Observations

Monday

8

2

10

Tuesday

7

1

8

Wednesday

9

3

12

Thursday

7

3

10

Friday

8

2

10

Saturday

6

4

10

If the administrator wants a 95 percent confidence level and a degree of precision of ±4 percent, how many more observations are needed?

Solution

The total number of observations made was 60. The clerk was observed to be idle 15 times. The initial estimate of the sample proportion is p ^ =15/60=0.25. The required sample size for a precision of ±4 percent ...

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Publisher Resources

ISBN: 9780134741062