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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 9.99
Average GPA for sophomores in North Quad 10.55
Regression Analysis: Freshmen Coefficients t Stat P-value
Intercept 8.79 6.75 2.97E-09
SAT 0.000843 1.38 0.17183
North Quad Residency -0.561 -2.35 0.0214
Nights Out 0.00214 0.0190 0.985
iPhone 0.106 0.389 0.698
Blackberry -0.159 -0.567 0.573
Republican -0.0571 -0.217 0.829
Multiple R 0.313
R Square 0.0981
Adjusted R Square 0.024
Standard Error 0.986
Observations 80
F 1.32
Significance F 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 t Stat P-value
Intercept 7.47 4.86 1.67E-05
SAT 0.00154 2.16 0.036739
North Quad Residency 0.165 0.554 0.582
Nights Out -0.128 -1.02 0.316
iPhone 0.219 0.515 0.609
Blackberry 0.0215 0.0612 0.952
Republican 0.0712 0.201 0.842
Multiple R 0.349
R Square 0.122
Adjusted R Square -0.00370
Standard Error 0.995
Observations 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