QuestionQ140

Chapter 4: Test Analysis and Design

Calculate the measurement-error SD for the following estimates made using the three-point estimation technique:

  • Most optimistic effort (a): 120 person-days
  • Most likely effort (m): 180 person-days
  • Most pessimistic effort (b): 240 person-days
  • A 20
  • B 120
  • C 180
  • D 197
Explanation

In three-point (PERT) estimation, the standard deviation is one-sixth of the difference between the pessimistic and optimistic estimates: ((240 - 120) / 6 = 20) person-days.

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