Installing mufflers at the Stanley Garage in Golden, Colorado, involves five work elements. Linda Stanley has timed workers performing these tasks seven times, with the results shown in the following table. Job elements OBSERVATIONS (MINUTES) Performance rating (%) 1 2 3 4 5 6 7 1 Select correct mufflers 4 5 4 6 4 15 4 100 2 Remove muffler 6 8 7 6 7 6 7 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 By agreement with her workers, Stanley allows a 10% fatigue factor and a 10% personal-time factor. To compute standard time for the work operation, Stanley excludes all observations that appear to be unusual or nonrecurring. She does not want an error of more than 5%. What is the standard time for the task? How many observations are needed to assure a 95.45% confidence level?
Installing mufflers at the Stanley Garage in Golden, Colorado, involves five work elements. Linda Stanley has timed workers performing these tasks seven times, with the results shown in the following table. Job elements OBSERVATIONS (MINUTES) Performance rating (%) 1 2 3 4 5 6 7 1 Select correct mufflers 4 5 4 6 4 15 4 100 2 Remove muffler 6 8 7 6 7 6 7 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 By agreement with her workers, Stanley allows a 10% fatigue factor and a 10% personal-time factor. To compute standard time for the work operation, Stanley excludes all observations that appear to be unusual or nonrecurring. She does not want an error of more than 5%. What is the standard time for the task? How many observations are needed to assure a 95.45% confidence level?
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
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Installing mufflers at the Stanley Garage in Golden, Colorado, involves five work elements. Linda Stanley has timed workers performing these tasks seven times, with the results shown in the following table.
|
Job elements |
OBSERVATIONS (MINUTES) |
Performance rating (%) |
|||||||
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|||
|
1 |
Select correct mufflers |
4 |
5 |
4 |
6 |
4 |
15 |
4 |
100 |
|
2 |
Remove muffler |
6 |
8 |
7 |
6 |
7 |
6 |
7 |
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 |
By agreement with her workers, Stanley allows a 10% fatigue factor and a 10% personal-time factor. To compute standard time for the work operation, Stanley excludes all observations that appear to be unusual or nonrecurring. She does not want an error of more than 5%.
- What is the standard time for the task?
- How many observations are needed to assure a 95.45% confidence level?
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