Transcript What effect does North Quad have on CMC students’ GPA?

The North Quad Struggle
Nathalie Ramirez, Peter Jebsen,
Nick Wright
Does where you live at CMC affect
your GPA?
• Freshman year, dorm placement is random
• Because assignment is random, differences in
GPA will be due purely to environmental factors
• Sophomore year, students choose their dorm
• Assignment is no longer random, and students
inherent abilities also become a factor
Hypotheses
• Students who live in North Quad will have
a lower GPA than students who live in
South or Mid Quad
• This will be true both freshman and
sophomore year
Conceptions about the Quads
North Quad stereotypes:
-Loud
-Social
-Open, conducive to partying
-Dirty
-Residents are raging alcoholics who spend all of
their time partying, and never do school work.
Mid & South Quad stereotypes:
-Quiet
-Anti-Social
-Indoor buildings, less conducive to partying
-Clean (more for South Quad)
-Residents are nerdy introverts who never go out,
and always have their heads in a book studying
Fun Fact
* Out of 32 parties this year,
North Quad has hosted 25,
with South Quad and Mid
Quad hosting only 7 combined
Research Design
• We asked a sample of 86 CMC students from all
class years to fill out a survey:
• SAT Score
• Freshman fall GPA, freshman dorm
• Sophomore fall GPA, sophomore dorm
• Republican or Democrat?
• iPhone or Blackberry?
• Average number of nights drinking per week
Summary Statistics
Mean SAT I Score
2085
Mean GPA Freshman fall
10.36
Mean GPA Sophomore fall
10.57
Average Nights Out
2.3
Percentage who are Republicans
24%
Percentage who own a Blackberry
24%
Percentage who own an iPhone
24%
So how ‘bout those North
Quadders?
Average GPA for freshmen in North Quad
Average GPA for sophomores in North Quad
9.99
10.55
Regression Analysis: Freshmen
Coefficients
Intercept
t Stat
P-value
8.79
6.75
2.97E-09
0.000843
1.38
0.17183
-0.561
-2.35
0.0214
0.00214
0.0190
0.985
0.106
0.389
0.698
Blackberry
-0.159
-0.567
0.573
Republican
-0.0571
-0.217
0.829
SAT
North Quad Residency
Nights Out
iPhone
Multiple R
0.313
R Square
0.0981
Adjusted R Square
0.024
Standard Error
0.986
Observations
F
Significance F
80
1.32
0.258
•Living In North Quad your freshman year has a significant negative effect on
GPA
•Because dorm placement is random, this effect is a pure Residence Effect
•Having a Blackberry produces a negative effect on GPA, while having an
iPhone produces a positive effect (!)
Regression Analysis: Sophomores
Coefficients
Intercept
t Stat
P-value
7.47
4.86
1.67E-05
0.00154
2.16
0.036739
0.165
0.554
0.582
-0.128
-1.02
0.316
0.219
0.515
0.609
Blackberry
0.0215
0.0612
0.952
Republican
0.0712
0.201
0.842
SAT
North Quad Residency
Nights Out
iPhone
Multiple R
0.349
R Square
0.122
Adjusted R Square
-0.00370
Standard Error
Observations
0.995
49
F
0.971
Significance F
0.457
•The Choice Effect shows the effect on GPA of being a student who chooses to
live in North Quad
•The Total Effect (XT) is a combination of the Residence Effect ( X R) and the
Choice Effect (XC), such that
XR + XC = XT
•Residence Effect (XR) = 0.561
•Total Effect (XT) = 0.165
•The Choice Effect:
XT – XR = XC
0.165 – (-0.561) = 0.726
•Students who choose to live in North Quad are inherently able to attain
GPAs 0.726 higher than students who do not choose to live there
•This suggests that students choose to live in North Quad because they
know they can perform well despite the detrimental environmental factors
So…
(North Quad Freshmen)
+
-0.159
+
-0.0571
-0.561
= -0.78 = TOUGH LUCK