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Unformatted text preview: Economics 120B Spring 2008 Dr. Maria Cndido Student Name:_____________________________________ Student ID:________________________________________ Economics 120B Final Examination Answer Key Spring Quarter June 9 th , 2008 Instructions: a. You have three hours to finish your exam. Write your name and ID number on the upper left corner of this page. And, in case you wish to do so, please sign the Buckley Waiver. STUDENT CONSENT FOR RELEASE OF STUDENT INFORMATION (Buckley Waiver) I hereby authorize the UCSD Economics Department to return my graded final examination/research paper by placing it in a location accessible to all students in the course. I understand that the return of my examination/ research paper as described above may result in disclosure of personally identifiable information, that is not public information as defined in UCSD PPM 160-2, and I hereby consent to the disclosure of such information. S i g n a t u r e b. Confirm that your test has 13 pages. Make sure you find the formula sheet, as well as critical values tables, in the pages of your exam. The last page can be used as scratch paper. c. There are two parts to this exam multiple-choice questions (Part I) and longer questions (Part II). You do not need to justify your answers for the multiple-choice questions. Show ALL your work for the longer questions. d. Use a pencil to enter the multiple choice answers in the scantron. Use a pen to write your answers to the problems. You give up your right to a regrade if you choose to use a pencil to answer the problems. e. The table below indicates how points will be allocated on the exam. You can answer the questions in any order you like. Use your time carefully and efficiently. Question Points Part I 24 Part II 1. 15 2. 12 3. 8 4. 5 5 8 6 12 7 8 8 8 Exam Total 100 f. With you, you should only have a pen, a pencil, and a calculator. 1 g. You will NOT be allowed to leave the room during the exam. Turn off your cell phone and your IPod, and good luck! Economics 120B Spring 2008 Dr. Maria Cndido PART I: Multiple-Choice Questions (1.5 points each, 24 points total). Enter your answers in the provided Scantron. 1) Which of the following are consequences of heteroskedasticity? (i) The OLS estimators are not consistent. (ii) The OLS estimators are no longer BLUE (Best Linear Unbiased Estimator). a. Only (i) is a consequence of heteroskedasticity. b. Only (ii) is a consequence of heteroskedasticity. c. Both are consequences of heteroskedasticity. d. None are consequences of heteroskedasticity. 2) If you had a regression model with two regressors, then omitting one variable which is relevant a. will have no effect on the coefficient of the included variable if the correlation between the excluded and the included variable is negative....
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