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

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

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Industrial Engineering and Production Management
In order that linear programming techniques provide valid results

Relations between factors must be linear (positive)
Only one factor should change at a time, others remaining constant
Either (A) or (B)
Relations between factors must be linear (negative)

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