Joyce Jacobsen and Manolis Kaparakis
QAC 201
Summer 2010
June 28, 2010
Answers to Midterm
(1) a. Discuss whether results would be biased upwards or downwards based on your view of how
memory reliability works. Not obvious that there would be bias overall

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
6th Class
6/14/10
Statistics are no substitute for judgment.
Henry Clay
Econ 300: hand out review sheet and answer sheet for test and direct to old test on-line
[show overhead re co

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
5th Class
6/11/10
No one can possibly win at roulette unless he steals money from the table while the
croupier isn't looking.
Albert Einstein
on Mon. will hand out review sheet (pra

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
4th Class
6/10/10
There are two times in a man's life when he should not speculate: when he can't afford it, and
when he can. - Mark Twain
summarizing our important results so far:

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
7th Class
6/15/10
The race may not always go to the swift, nor the battle to the strong, but thats the way
to bet it.-Damon Runyon
another take on correlation and causation [show ca

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
2nd Class
6/8/10
The statistics you don't compile never lie.
Stephen Colbert
show updated website with workshop dates and times
bring book to class as we will use it often to look a

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
9th Class
6/18/10
When it is not in our power to follow what is true, we ought to follow what is most
probable.-Descartes
show results from M&M experiment
[overhead]
sampling distri

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
8th Class
6/17/10
Statistical thinking will one day be as necessary for efficient citizenship as the ability to
read and write.-H.G. Wells
review main result from Ch. 6:
Normal Appr

1
1. An appropriate random sample of 65 students drawn from a graduating class of 640 students
at Arcadia High School. (near LA CA; upper middle class suburban community.)
SAT
GPA
APMATH
APENG
ESL
GEND
PREP
AP
RACE
combined SAT score for ith student (math

1.
Your friend estimated a regression model using Stata and sent you the following table
Source |
SS
df
MS
-+-Model | _(a) 4 11.3251329
Residual | 87.5332199
470 .186240893
-+-Total | 132.833752
474 .280239982
Number of obs =
475
F( 4,
470)

Joyce Jacobsen and Manolis Kaparakis
QAC 201
Summer 2010
June 24, 2010
Midterm
Please send your answers to both of us (jjacobsen, mkaparakis) as an email attachment no later than
5:30 pm on Friday June 25.
(1) (10 points) According to the Center for Disea

Econ 300/QAC 201: Quantitative Methods in Economics/Applied Data Analysis
3rd Class
6/9/10
Events with a-million-to-one odds happen 295 times a day in America.
Michael Shermer
Why People Believe Weird Things
Last time I asked for a 95% CI for the populati