The variance of the project completion time is equal to the sum of the variances of all the activities.

Question

Quizplus · Accepted Answer

This statement is incorrect. The variance of the project completion time is not necessarily equal to the sum of the variances of all the activities as the activities may have interdependencies and may affect each other's duration and variance. The variance of the project completion time can be affected by critical path activities or bottlenecks that have a higher variance than other activities. Hence, the variance of the project completion time is usually calculated by considering the dependencies and critical path activities.

The Variance of the Project Completion Time Is Equal to the Sum