FINAL EXAM
STAT 101, Instructors: A. Rakhlin
December 21, 2010
Student Name:
Section:
Instructions
•
Use the space provided to answer questions. You can use the back of these pages
as scratch paper.
•
You must show work and give explanations (except for the multiplechoice questions).
•
Rules of uniformity: Twosided letter crib sheet, calculator ok (even with statistical functions
and graphing), otherwise closed notes, closed book.
•
No cell phones visible!
•
Rules of Fairness:
–
Complete this exam entirely on your own. Do not acquire information from other stu
dents or the outside in any form.
–
Do not take copies of this exam out of this room.
–
You have two hours for this exam. Any student observed continuing to write after time
has been called will be documented and points will be deducted.
•
Rules of Consideration:
–
Be considerate to others by not causing commotion and distraction.
–
If you finish early, leave quietly; avoid slamming doors.
Honor code applies to the above Rules.
Your signature:
About this test: When more than one choice seems reasonable, pick the one that is best.
STOP
WAIT UNTIL YOU ARE INSTRUCTED TO PROCEED.
21 questions for a total of 100 points.
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STAT 101
Final Exam
1. (2 points) How is the standard deviation in a sample affected by the removal of three most
extreme observations on both sides?
(a) It remains the same.
(b) It becomes smaller.
(c) It becomes larger.
(d) There is an effect but it is not predictable.
2. (2 points) For a random variable X with a normal distribution,
P
(
X > μ
) =
3. (3 points) If the random variables
X
and
Y
have zero correlation, then they are
4. (3 points) If the probability of a market drop greater than 3% is 0.005 and the probability of a
market drop greater than 5% is 0.001, then the probability of a market drop between 3% and
5% is
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 Fall '08
 Heller
 Statistics, Standard Deviation, Variance

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