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
Permits a fine breakdown of activities and delays
No time measuring devices are generally needed
Simultaneous study of many operators may be made by a single observer

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Industrial Engineering and Production Management
Which of the following are the guidelines for the construction of a network diagram?

Dummy activity consumes no time or resource
All of the these
Dangling must be avoided in a network diagram
Each activity is represented by one and only one arrow in the network

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Industrial Engineering and Production Management
When slack of an activity is negative

It represents a situation where extra resources are available and the completion of project is not delayed
It represents that a programme falls behind schedule and additional resources are required to complete the project in time
All of these
The activity is critical and any delay in its performance will delay the completion of whole project

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