First 5 letters of your last name
OSU “Dot” Number
Name: ________________________________________________
last
first
MI
Recitation Day and Start Time:
_____________________
Instructions:
You must use
pencil
to write your exam.
Turn
off
all cell phones and pagers.
You may
not
use cell phones or other PDA’s for any purpose during
the exam.
Leave the exam paper
CLOSED
until you are instructed to begin.
Probability table(s) and formulas will be distributed separate from the exam paper.
Do not write on
these.
Return both documents with your completed exam.
You may
not leave the room
for any reason before you submit your paper.
You may
not
ask questions during the exam.
Circle
the best answer to each multiplechoice question.
Answer all freeresponse questions
neatly
in the
spaces provided.
For all questions that require work you must show the formula and at least one intermediate calculation.
Page Number
Points
1
12
2
12
3
6
4
12
5
8
Total
50
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Questions 1 – 15 are worth 2 points each.
1. Given that
Z
is a standard normal variable, the value
z
for which
P
(
Z
!
z
) = 0.6736 is
a.
0.1736
b.
0.45
c.
0.1736
d.
0.45
2. For some positive value of
x
, the probability that a standard normal variable is between 0 and
+ 2
x
is 0.1255.
The value of
x
is
3. Which of the following statements is not true?
4. The owner of a local nightclub has recently surveyed a random sample of
n
= 300 customers
of the club.
She would now like to determine whether or not the mean age of her customers is
over 35.
If so, she plans to alter the entertainment to appeal to an older crowd.
If not, no
entertainment changes will be made.
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 Spring '08
 SCHROEDER
 Statistics, Normal Distribution, Standard Deviation, Statistical hypothesis testing

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