MAT 221 Midterm: MAT_221_SP_14
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MAT
221
Final
Exam
5 May 2014
Prof. Suanne
Au
Name=~~
______________
_
SUID:
__________
_
Check
that
there
are
8 questions in this exam. Show your work or reasoning
wherever possible
to
receive full credit. You may use a calculator for arith-
metics only.
j Problem j Points j Score j
1 5
2
10
3
15
4
15
5
10
6
15
7
20
8
10
Total
100
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(1)
(5 points)
The
final exam srores of a
math
class
a.re
listed below:
62, 73,
75, 77, 78,
81, 85,
86,
88, 92, 94, 96, 97
Give a 5-number summary for
the
data.
(2)
(10
points) A recent article on
CareerBuilder.
com
noted
that
about 40% of all
employers are now using social networking sites such as Facebook, MySpace and
Linkedln to research job applicants. Suppose a sample of 160 hiring managers was
randomly selected, what
is
the probability
that
at
least 30%
of
them will say they
use social networking sites to reseach
job
applicants?
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(3)
(15 points)
The
National Association of Colleges and Employers reported
that
the
mean yearly salary offer for students graduating with accounting degrees in
2010
was $48,700. Suppose
that
a random sample of 50 accounting graduates
at
a large
university who received job offers resulted in a mean offer of $49,500. Assume the
distribution
of
offers obtained by accounting graduates
at
this university has a stan-
dard
deviation of $3,000. Carry out a significance
test
to
determine whether the
mean salary offer for accounting graduates of this university
is
different from
the
2010 national average of $48,700. Be sure to give a conclusion in context.
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MAT 221 Full Course Notes
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