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Business
Operations Management
OBSERVATIONS (MINUTES) PERFORMANCE RATING (%) 1 2 3 4 5 6 7 45 4 6 4 15 4 6 8 7 6 7 6 7 JOB ELEMENT 1. Select correct mufflers 110 2. Remove old muffler 90 3. Weld/install new muffler 15 14 14 12 15 16 13 105 4. Check/inspect work 3 4 24 5 4 3 18 100 5. Complete paperwork 5 6 8 7 6 7 130 - Employee has lengthy conversations with boss (not job related).

OBSERVATIONS (MINUTES) PERFORMANCE RATING (%) 1 2 3 4 5 6 7 45 4 6 4 15 4 6 8 7 6 7 6 7 JOB ELEMENT 1. Select correct mufflers 110 2. Remove old muffler 90 3. Weld/install new muffler 15 14 14 12 15 16 13 105 4. Check/inspect work 3 4 24 5 4 3 18 100 5. Complete paperwork 5 6 8 7 6 7 130 - Employee has lengthy conversations with boss (not job related).

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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Installing mufflers at the O'Sullivan Garage in Golden, Colorado, involves five work elements. Jill O'Sull ivanhas timed workers performing these tasks seven times, with the results shown in the following table:                                                                                                                                                By agreement with her workers, Jill allows a 10% fatigue factor and a 10% personal-time factor, but no time for delay. To compute standard time for the work operatio n, Jill excludes all observations that a ppear to be unusual or nonrecurring. She does not want an error of mo re than ±5%.
a) What is the standard time for the task?
b) How many observations are needed to assu re a 95% confidence level?
OBSERVATIONS (MINUTES) PERFORMANCE RATING (%) 1 2 3 4 5 6 7 45 4 6 4 15 4 6 8 7 6 7 6 7 JOB ELEMENT 1. Select correct mufflers 110 2. Remove old muffler 90 3. Weld/install new muffler 15 14 14 12 15 16 13 105 4. Check/inspect work 3 4 24 5 4 3 18 100 5. Complete paperwork 5 6 8 7 6 7 130 - Employee has lengthy conversations with boss (not job related).
Transcribed Image Text:OBSERVATIONS (MINUTES) PERFORMANCE RATING (%) 1 2 3 4 5 6 7 45 4 6 4 15 4 6 8 7 6 7 6 7 JOB ELEMENT 1. Select correct mufflers 110 2. Remove old muffler 90 3. Weld/install new muffler 15 14 14 12 15 16 13 105 4. Check/inspect work 3 4 24 5 4 3 18 100 5. Complete paperwork 5 6 8 7 6 7 130 - Employee has lengthy conversations with boss (not job related).
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