Work sampling observations are systematically scheduled and recorded on the basis of_______________?
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Answer: C. table of random numbers
Explanation
Work sampling observations must be scheduled randomly to eliminate personal bias from the data. A table of random numbers ensures that every observation time has an equal chance of selection. Statistical validity relies heavily on random sampling techniques to accurately reflect true work activities. Work sampling is a statistical technique used to determine the proportion of time spent on various activities. Random timing prevents operators from altering their normal behavior when observers are scheduled to arrive. Industrial engineers use random number tables to generate unbiased observation schedules throughout the shift.
Plant managers use work sampling to evaluate machine utilization and identify sources of manufacturing downtime. This method is much more cost-effective than continuous time study for long-cycle assembly operations. Accurate activity ratios help facilities optimize staffing levels and improve overall operational productivity. Detailed calculations are used during data analysis rather than for scheduling the raw observation times. Convenience scheduling introduces severe human bias and invalidates the statistical accuracy of the study. Past experience does not provide the mathematical randomness required for valid work sampling schedules.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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