Test 2  Statistics 211509 (Fall 2006)
Name:
Student ID:
•
This test consists of 5 numbered pages. Make sure you have all 8 pages. It is your
responsibility to inform me if a page is missing!!!
•
You have 50 minutes to complete this test.
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You may use the provided crib sheets, all appropriate tables and a calculator.
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If I provide partial results—assume they are correct and use them even if they are not.
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If there is no correct answer or if multiple answers are correct, select the
best
answer.
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There is no penalty to wrong answers.
. .
so guess if you do not know an answer.
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It is your responsibility to look at the overhead or blackboard about every 15 minutes
and to incorporate any relevant information into your test.
1
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View Full DocumentChapter 4
1. The time headway in traﬃc ﬂow is the time between two randomly selected consecutive
cars (sec). Suppose the density function of time headway is
f
(
x
) =
(
4
x

5
if
x >
1
0
otherwise
,
and the distribution function is
F
(
x
) = 1

x

4
, for
x >
1. The 99
th
percentile for this
distribution.
(a) 10
1
/
4
(b)
√
10
(c) (4
/
0
.
99)
1
/
5
(d) (4
/
0
.
01)
1
/
4
Suppose the force acting on a column that helps to support a building is normally
distributed with mean 15.6 kips and standard deviation 1.6 kips. Answer the following
two questions.
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 Spring '08
 PROUT
 Normal Distribution, Geography, Probability theory, Corr, randomly selected student

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