Test1 - Test 1 - Thursday, March 4 2010 Econ 3200 -...

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Test 1 - Thursday, March 4 2010 Econ 3200 - Introduction to Econometrics Spring 2010 Cornell University Prof. Molinari This exam consists of TWO parts totaling 100 points. This is a CLOSED BOOK exam. However, useful formulas are provided on separate pages. Tables for the Normal, t , and 2 distributions are You have 75 minutes to complete the exam. SHOW ALL your work as partial credit will be given. Answers without explanations might NOT be given (full) credit even if they are correct. THINK before you answer, and GOOD LUCK! Part I: Short Answer (20 points, 4 points each) In a few sentences, brie±y de²ne/describe the following. Use formulas if you think they will make your answers more precise, but a formula without a written explanation is not an acceptable answer. 1. R 2 : 2. Explained Sum of Squares. 3. Mean Squared Error. 4. Interpreting the slope coe¢ cient of a linear regression. 5. Convergence in mean squared. 1
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Part II: 2 Long Questions, 80 Points (40 points each) more regularly. In fact, there has also been a growing interest among educators on whether the old Latin saying ±Mens sana in corpore sano²(which means ±A healthy mind in a healthy body²) is true, and in particular on whether students who exercise regularly perform better academically. In order to better understand the relationship between physical exercise and academic performance, an Ivy League University collected the gym attendance records of 650 of hours per week ( hours i ) each student in the sample spent in the gym. Using data on the GPAs of these 650 students, the following regression model estimates were obtained using OLS. (Standard errors for each estimate are given in parentheses.)
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This note was uploaded on 04/14/2010 for the course ECON 3200 taught by Professor Neilsen during the Spring '08 term at Cornell University (Engineering School).

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Test1 - Test 1 - Thursday, March 4 2010 Econ 3200 -...

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