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
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest start time of succeeding event earliest finish time of preceding event activity time
Latest start time of the event earliest start time of the event
Latest finish time of event earliest finish time of the event
Anyone of the above

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