statsexam3s09a

statsexam3s09a - Economic Statistics Exam 3a Spring 2009...

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Economic Statistics Exam 3a Last name: Spring 2009 First name: PPID: Section number: Please sign that you abide by the honor pledge: This exam contains twenty short answer questions ( worth 6 points each ) and four long answer questions ( worth 15 points each ) . Show your work clearly to be eligible for partial credit. In all problems where you need to make a calculation, simplify your answer as much as convenient. In questions with multiple parts, you should respond as if your answers to previous parts were correct. Some PDFs: Some probabilities: f ( x ) = 1 2 !" 2 e # ( X # μ ) 2 " 2 P [ x ! a ] = e " # a f ( x ) = 1 u ! ! P [ X ] = x e ! X ! f ( x ) = ! e " x P [ X ] = N ! X !( N ! X )! p X (1 ! p ) N ! X Short Questions ( 6 points apiece ) 1. When testing a hypothesis, there are two mistakes we can make. Name and explain these errors. 2. What is “unobserved heterogeneity”?
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Econ 400 Exam 3, page 2 of 10. 3. Explain how to calculate the “correlation coefficient”. 4. According to my best calculations, there is a 0.20 chance that modern civilization collapses in the next year, a 0.30 chance that the current swine flu goes pandemic, and a 0.15 chance of both. What is the chance that neither disaster occurs? 5. Given that the swine flu pandemic happens, what is the chance that civilization collapses? 6. Construct a box - and - whisker plot with these numbers: 1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597 7. The National Weather Service gives us a 0.10 chance of rain on each of the seven days in the next week. If these events are independent, what is the chance that we have rain in the next week?
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Econ 400 Exam 3, page 3 of 10. 8. The random variable X is distributed normally with mean of 13 and variance of 9 .
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This note was uploaded on 03/19/2010 for the course ECON 400 taught by Professor Turchi during the Spring '08 term at UNC.

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statsexam3s09a - Economic Statistics Exam 3a Spring 2009...

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