SCMS331 Chapter 3

A project's critical path is composed of activities A (variance .33), B (variance .67), C (variance .33), and D (variance .17). What is the standard deviation on the critical path?

1.22

An activity has an optimistic time of 15 days, a most likely time of 18 days, and a pessimistic time of 27 days. What is the expected time?

19 days

An activity on a PERT network has these time estimates: optimistic = 1, most likely = 2, and pessimistic = 5. Its expected time is:

2.33

An activity on a PERT network has these time estimates: optimistic =2, most likely = 3, and pessimistic 8. Its expected time and variance (if it is a critical activity) are:

3.67 and 1

An activity has an optimistic time of 11 days, a most likely time of 15 days, and a pessimistic time of 23 days. What is its variance?

4

An activity on a PERT network has these time estimates: optimistic = 2, most likely = 5, and pessimistic = 10. Its expected time is:

5.33

Which of these statements regarding time-cost tradeoffs in CPM networks is true?

Crashing shortens the project duration by assigning more resources to one or more of the critical tasks.

The EF of an activity is the:

ES + Activity Time

Which of the following is determined during the forward pass?

Early Start

Which of the following statements regarding Gantt charts is true?

Gantt charts are visual devices that show the duration of activities in a project.

Which of the following is a basic assumption of PERT?

No activity in the network must be repeated.

Which of the following statements regarding PERT analysis is true?

Only critical activities contribute to the project variances.

The three phases involved in the management of large projects are:

Planning, scheduling, and controlling

PERT analysis computes the variance of the total project completion time as:

The sum of the variances of all activities on the critical path.

A simple CPM network has five activities, A, B, C, D, and E. A is an immediate predecessor of C and of D. B is also an immediate predecessor of C and of D. C and D are both immediate predecessors of E. Given the above scenario, how many networks are in this path?

There are four paths in the network.

WBS stands for which of the following project management tools?

Work Breakdown Structure

Dummy activities__________

are used when two activities have identical starting and ending events.

In a PERT network, non-critical activities that have little slack need to be monitored closely__________

because near-critical paths could become critical paths with small delays in these activities

The Beta distribution is used in project management to

calculate expected activity times

With respect to PERT and CPM, slack__________

is the amount of time a task may be delayed without changing the overall project completion time.

The critical path of a network is the__________

longest time path through the network

__________ is the amount of time an individual activity in a network can be delayed without delaying the entire project.

Slack time