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The North Quad Struggle Nathalie Ramirez, Peter Jebsen, Nick Wright

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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

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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

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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

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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

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Summary Statistics Mean SAT I Score2085 Mean GPA Freshman fall10.36 Mean GPA Sophomore fall10.57 Average Nights Out2.3 Percentage who are Republicans24% Percentage who own a Blackberry24% Percentage who own an iPhone24%

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So how ‘bout those North Quadders? Average GPA for freshmen in North Quad9.99 Average GPA for sophomores in North Quad10.55

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Regression Analysis: Freshmen Coefficientst StatP-value Intercept E-09 SAT North Quad Residency Nights Out iPhone Blackberry Republican Multiple R0.313 R Square Adjusted R Square0.024 Standard Error0.986 Observations80 F1.32 Significance F0.258 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 (!)

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Regression Analysis: Sophomores Coefficientst StatP-value Intercept E-05 SAT North Quad Residency Nights Out iPhone Blackberry Republican Multiple R0.349 R Square0.122 Adjusted R Square Standard Error0.995 Observations49 F0.971 Significance F0.457 The Choice Effect shows the effect on GPA of being a student who chooses to live in North Quad The Total Effect (X T ) is a combination of the Residence Effect ( X R ) and the Choice Effect (X C ), such that X R + X C = X T

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Residence Effect (X R ) = Total Effect (X T ) = The Choice Effect: X T – X R = X C – (-0.561) = Students who choose to live in North Quad are inherently able to attain GPAs 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

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So… + + = = TOUGH LUCK (North Quad Freshmen)

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