ECON 312 Final: ECON312 Final1Spring2016solution
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Instructions: this is closed book, closed notes exam, no calculators of any kind are allowed, show all the steps and calculations, if you need more space, use the back of the page, fully label all graphs. Britney studies the factors a ecting sat scores of students. She collected data on 4137 high school students, with the following variables: combined sat (scholastic assessment test) score (points) size of graduating class (100s of students) Variable description sat hsize hsizesq hsize2 (hsize squared) female black dummy (=1 if female, 0 otherwise) dummy (=1 if black, 0 otherwise) Britney(cid:146)s r command and regression output are presented below: lm(sat ~ hsize + hsizesq + female + black + female*black, data = gpa2) Error t value pr(>|t|) (intercept) 1028. 0972 6. 2902 163. 445 < 2e 16 *** hsize. Residual standard error: 133. 4 on 4131 degrees of freedom. F statistic: 77. 52 on 5 and 4131 df, p value: < 2. 2e 16 (a) (5 points).
