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ECON 2843
Name
KEY
Exam 2
ID #
Spring 2007
Lab Instructor
Form A
Lab Meeting Time
Students must show all work on problems that involve calculation, even if the answer is multiple
choice.
Questions 1 – 3 refer to the following.
Scores on an entrance examination for both Business students and Arts and Sciences students
are normally distributed.
Those students with scores over 450 will have priority in registration.
1.
If scores for Arts and Sciences graduates have a mean of 500 and a standard
deviation of 40, what is the probability that an Arts and Sciences graduate will
have priority in registration?
(5 points)
a.
.1056
b.
.1250
c.
.6844
d.
.8944
*
e.
.9500
2.
If scores for Business graduates have a mean of 420 and a standard deviation of
50, what is the probability that a Business graduate will have priority in
registration?
(5 points)
.2743
3.
Suppose that we randomly sample 108 Business students.
What is the probability that
over half of them will have priority in registration? (5 points)
Approximately 0
1
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View Full Document4.
Circle true or false.
The sample standard deviation is an unbiased estimator of
the population standard deviation.
(5 points)
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 Spring '08
 HUDGINS

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