Free PMP Exam Sample Question
The following PMP® exam sample question is taken from the Free PMP Exam Simulator:
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The PMBOK Guide recommends the use of the PERT formula for estimating durations and costs. However, there are situations when three points (optimistic, most likely and pessimistic) are not available. Rather, only upper and lower limits are available. For these kinds of situations, which statistical distribution can you use for your estimations?
A.) Beta Distribution
B.) Uniform Distribution
C.) Normal Distribution
D.) Triangular Distribution
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Hint: Beta and triangular are three-point distributions.
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Cornelius Fichtner, PMP
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bkthakkar
Tue, 04/02/2013 - 14:59
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when control limits r
when control limits r specified which means they are normally distributed on either side of mean to the extent of 3sigma(ref page 196, pmbok)
which clearly gives the direction that it follows normal distribution.
Please correct me if i am wrong
Bhavesh
crushPMP
Tue, 04/02/2013 - 15:56
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Use the bell curve aka Normal
Use the bell curve aka Normal Distribution.
sspawar
Wed, 04/03/2013 - 01:15
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Except Normal distribution,
Except Normal distribution, all 3 of above options have by default lower and upper limits.
in normal distribution , limits are introduced as per the case and need, for example generally +/- 3sigma, it may be +/-6sigma or +/-2sigma, as the case vary. In an absolute case ND is a infinite limit curve.
Question's intention is for option B uniform distribution, because in this case only one value (single data) is distributed continously within a range (a to b--- limits), in uniform way.
but in this case, value of that sigle data is also needed.
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ONLY LOWER AND UPPER LIMIT CAN NOT MAKE AN ESTIMATE.
( value at y ordinate is always needed, generally limits at x axis are required in all cases of continuous distributions -above 4 options)
Thus this question is technically not fit.
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in place of
Rather, only upper and lower limits are available.
it can be asked, -- Rather, a single value is given for a particular range.