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1. a) An operation consisting of three elements has been subjected to a stopwatch time study. The raw data are contained in the table below. The allowance for the operation is 20%. What is the standard time for the operation? What should the standard time be in hours per 1000 units? Observations (seconds/element) Performance Mean Normal Job rating time time (%) 1 2 3 4 5 6 7 8 9 10 seconds seconds 1 90 7 7 8 9 8 10 10 8 9 7 2 100 14 14 18 15 14 14 15 16 16 14 3 110 8 7 8 9 9 7 7 8 7 8 b) The time study analyst in above example wants to determine if his sample size was large enough. A confidence of 95% with a precision of ± 5% is desired. What is the required sample size? c) Differentiate among actual time, normal time, and standard time.

          1. a) An operation consisting of three elements has been subjected to a stopwatch time study. The raw data are contained in the table below. The allowance for the operation is 20%. What is the standard time for the operation? What should the standard time be in hours per 1000 units?

Observations (seconds/element)
Performance Mean Normal
Job rating time time
(%) 1 2 3 4 5 6 7 8 9 10 seconds seconds

1 90 7 7 8 9 8 10 10 8 9 7
2 100 14 14 18 15 14 14 15 16 16 14
3 110 8 7 8 9 9 7 7 8 7 8

b) The time study analyst in above example wants to determine if his sample size was large enough. A confidence of 95% with a precision of ± 5% is desired. What is the required sample size?

c) Differentiate among actual time, normal time, and standard time.

1. a) An operation consisting of three elements has been subjected to a stopwatch time study. The raw data are contained in the table below. The allowance for the operation is 20%. What is the standard time for the operation? What should the standard time be in hours per 1000 units?

Observations (seconds/element)
Performance Mean Normal
Job rating time time
(%) 1 2 3 4 5 6 7 8 9 10 seconds seconds

1 90 7 7 8 9 8 10 10 8 9 7
2 100 14 14 18 15 14 14 15 16 16 14
3 110 8 7 8 9 9 7 7 8 7 8

b) The time study analyst in above example wants to determine if his sample size was large enough. A confidence of 95% with a precision of ± 5% is desired. What is the required sample size?

c) Differentiate among actual time, normal time, and standard time.

Added by Courtney M.

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