Industrial Engineering and Production Management
In CPM, the cost slope is determined by

Crash cost/Normal Cost
Normal Cost/Crash cost
(Crash Cost - Normal cost)/ (Normal time - Crash time)
(Normal cost - Crash cost)/ (Normal time - Crash time)

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

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
No time measuring devices are generally needed

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