Industrial Engineering and Production Management
Pick up the incorrect statement about advantages of work sampling

No time measuring devices are generally needed
Simultaneous study of many operators may be made by a single observer
Permits a fine breakdown of activities and delays
Calculations are easier, method is economical and less time consuming

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Industrial Engineering and Production Management
Pessimistic time is

The maximum time which an activity might require
The most probable time considering all conditions
The average time required for a job
The minimum time in which an activity can possibly be accomplished

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