10.30 Installing mufflers at the O'Sullivan Garage in Golden, Colorado, involves five work elements. Jill O'Sullivan has timed workers performing these tasks seven times, with the results shown in the following table: OBSERVATIONS (MINUTES) JOB ELEMENT 1 2 3 4 5 6 7 4 5 4 6 4 15² 4 1. Select correct mufflers 2. Remove old muffler 6876767 3. Weld/install new muffler 15 14 14 12 15 16 13 3 4 24 5 4 3 18³ 568 7 6 7 4. Check/inspect work 5. Complete paperwork *Employee has lengthy conversations with boss (not job related). PERFORMANCE RATING (%) 110 90 105 100 130 By agreement with her workers, Jill allows a 10% fatigue factor and a 10% personal-time factor, but no time for delay. To com- pute standard time for the work operation, Jill excludes all obser- vations that appear to be unusual or nonrecurring. She does not want an error of more than 15%. a) What is the standard time for the task? b) How many observations are needed to assure a 95% confi- dence level? PX

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QUESTION 1 (WORK MEASUREMENT: STOPWATCH TIME STUDY)
.. 10.30 Installing mufflers at the O'Sullivan Garage in
Golden, Colorado, involves five work elements. Jill O'Sullivan
has timed workers performing these tasks seven times, with the
results shown in the following table:
OBSERVATIONS
(MINUTES)
JOB ELEMENT
1 2 3 4 5 6 7
45 46 415²4
1. Select correct mufflers
2. Remove old muffler
68767 6 7
3. Weld/install new muffler 15 14 14 12 15 16 13
4. Check/inspect work
18ª
3 4 24³ 5 4 3
568
5. Complete paperwork
*Employee has lengthy conversations with boss (not job related).
7 6 7
PERFORMANCE
RATING (%)
110
90
105
100
130
By agreement with her workers, Jill allows a 10% fatigue factor
and a 10% personal-time factor, but no time for delay. To com-
pute standard time for the work operation, Jill excludes all obser-
vations that appear to be unusual or nonrecurring. She does not
want an error of more than ±5%.
a) What is the standard time for the task?
b) How many observations are needed to assure a 95% confi-
dence level? PX
Transcribed Image Text:QUESTION 1 (WORK MEASUREMENT: STOPWATCH TIME STUDY) .. 10.30 Installing mufflers at the O'Sullivan Garage in Golden, Colorado, involves five work elements. Jill O'Sullivan has timed workers performing these tasks seven times, with the results shown in the following table: OBSERVATIONS (MINUTES) JOB ELEMENT 1 2 3 4 5 6 7 45 46 415²4 1. Select correct mufflers 2. Remove old muffler 68767 6 7 3. Weld/install new muffler 15 14 14 12 15 16 13 4. Check/inspect work 18ª 3 4 24³ 5 4 3 568 5. Complete paperwork *Employee has lengthy conversations with boss (not job related). 7 6 7 PERFORMANCE RATING (%) 110 90 105 100 130 By agreement with her workers, Jill allows a 10% fatigue factor and a 10% personal-time factor, but no time for delay. To com- pute standard time for the work operation, Jill excludes all obser- vations that appear to be unusual or nonrecurring. She does not want an error of more than ±5%. a) What is the standard time for the task? b) How many observations are needed to assure a 95% confi- dence level? PX
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