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Unformatted text preview: Northwestern University Department of Economics STAT 210 Introduction to Statistics Professor: Steffen Habermalz First Midterm Examination February 1 st 2008 INSTRUCTIONS : Please read the whole exam first. Questions are not ordered by difficulty. Answer all questions. Make sure you show ALL your work. Merely reporting the correct answer will not result in full credit. Write legibly. If we cant read it, we wont grade it. GOOD LUCK! 1. Write your name and circle your TAs name on the answer sheet. 2. (2+3=5 pts. each) True/False: State if the following statements are true or false. Only clearly explained answers earn full credit . a. P(AUB)= P(A C B) + P(AB C ) + P(AB) TRUE. Use a Venn-diagram to show this. b. If ( 29 | E Y X = then ( 29 E Y = where is a constant and X and Y are random variables. TRUE. Use the Law of iterated Expectations ( 29 ( 29 [ ] | X X E Y E E Y X E = = = c. Consider X X X Z - = where X is a random variable with mean...
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This note was uploaded on 09/25/2010 for the course ECON 210 taught by Professor Pavan during the Winter '09 term at Northwestern.
- Winter '09