Time-Study Observation Sheet Identification of operation Stein assembly Date 7/15 Operator Smith Approval Observer Jones Russell Cycles Summary 3 7 9. 10 El RF Nt Place mug in visel holder upside down R0.12 2.05 4.04 5.92 7.86 9.80 11.73 13.65 15.64 17.59 1.05 Press both bracket sides around 2 handle R0.19 2.12 4.09 6.01 7.94 9.88 11.81 13.72 15.7 17.66 1.00 Solder bracket seam on inside of handle R 1.05 3.01| 4.91 6.87 8.81 10.71 12.66 14.56 16.52 18.50 1.10 Turn stein right side 4 up R 1.13 3.08 4.98 6.93 8.90 10.79 12.74 14.66 16.63 18.59 1.10 Solder lid top to 5 bracket R 1.75 3.76 5.65 7.60|9.56 11.45 13.36 15.34 17.31 19.28 1.05 Remove stein from 6 holder and place in box R 1.91 3.90 5.79 7.75 9.70 11.61 13.53 15.49 17.46 19.44 1.00 co 6.

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The Konishi Electronics Company manufactures computer
microchips. A particular job that has been under analysis as
part of a quality-improvement program was the subject of a
time study. The time study encompassed 20 job cycles, and

the results include the following cumulative times and per-
formance rating factors for each element:

a. Compute the standard time for this job using an al-
lowance factor of 15%.

b. Using a sample standard deviation of 0.51 minutes, de-
termine the number of cycles for this time study such

that the company would be 95% confident that the av-
erage time from the time study is within 5% of the true

average cycle time.

Time-Study Observation Sheet
Identification of operation
Stein assembly
Date
7/15
Operator
Smith
Approval
Observer
Jones
Russell
Cycles
Summary
3
7
9.
10
El
RF
Nt
Place mug in visel
holder upside down
R0.12 2.05 4.04 5.92 7.86 9.80 11.73 13.65 15.64 17.59
1.05
Press both bracket
sides around
2
handle
R0.19 2.12 4.09 6.01 7.94 9.88 11.81 13.72 15.7 17.66
1.00
Solder bracket seam
on inside of handle
R 1.05 3.01| 4.91 6.87 8.81 10.71 12.66 14.56 16.52 18.50
1.10
Turn stein right side
4
up
R 1.13 3.08 4.98 6.93 8.90 10.79 12.74 14.66 16.63 18.59
1.10
Solder lid top to
5
bracket
R 1.75 3.76 5.65 7.60|9.56 11.45 13.36 15.34 17.31 19.28
1.05
Remove stein from
6 holder and place in box
R 1.91
3.90 5.79 7.75 9.70 11.61 13.53 15.49 17.46 19.44
1.00
co
6.
Transcribed Image Text:Time-Study Observation Sheet Identification of operation Stein assembly Date 7/15 Operator Smith Approval Observer Jones Russell Cycles Summary 3 7 9. 10 El RF Nt Place mug in visel holder upside down R0.12 2.05 4.04 5.92 7.86 9.80 11.73 13.65 15.64 17.59 1.05 Press both bracket sides around 2 handle R0.19 2.12 4.09 6.01 7.94 9.88 11.81 13.72 15.7 17.66 1.00 Solder bracket seam on inside of handle R 1.05 3.01| 4.91 6.87 8.81 10.71 12.66 14.56 16.52 18.50 1.10 Turn stein right side 4 up R 1.13 3.08 4.98 6.93 8.90 10.79 12.74 14.66 16.63 18.59 1.10 Solder lid top to 5 bracket R 1.75 3.76 5.65 7.60|9.56 11.45 13.36 15.34 17.31 19.28 1.05 Remove stein from 6 holder and place in box R 1.91 3.90 5.79 7.75 9.70 11.61 13.53 15.49 17.46 19.44 1.00 co 6.
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