Which of the following statements regarding pert analysis is true? a. each activity has two estimates of its duration. b. project variance is the sum of all activity variances. c. only critical activities contribute to the project variance. d. the most likely time is equivalent to the expected activity time. e. project standard deviation is the sum of all critical activity standard deviations.

It's c.

Explanation:

Program Evaluation and Review Technique (PERT) is a method used in program management. It analyzes the time required to complete each task in a project and so tries to determine the minimum time to complete a project. It was developed by the US Navy in 1957.

In PERT analysis:

there are 3 time estimates for every activity: optimistic, pessimistic, and most likely you have to find the Critical Path. The Critical Path is the longest path of scheduled activities that must be met in order to execute a project.  It is important to know because any problems on the critical path can prevent a project from moving forward and be delayed. Therefore only critical activities can contribute to the project variance.

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