Which of the Following Statements Regarding PERT Analysis Is True

Multiple Choice

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) Project standard deviation is the sum of all critical activity standard deviations.
D) Only critical activities contribute to the project variance.
E) Only non-critical activities contribute to the project variance.