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statsexam2f09

# statsexam2f09 - Economic Statistics Exam 2 November 6 2009...

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Economic Statistics Exam 2 Last name: November 6, 2009 First name: PID: Please sign that you abide by the honor pledge: This exam contains ten short answer questions (worth 6 points each) and three long answer questions (worth 15 points each). Please answer in the space provided; if you need more room, indicate clearly that the answer is continued on the back of the page. In all problems where you need to make a calculation, simplify your answer as much as possible. Show your work clearly to be eligible for partial credit. Some PDFs: Some probabilities: f ( x ) = 1 2 !" 2 e # ( X # μ ) 2 " 2 P [ x ! a ] = 1 " 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 1. A random variable, X , has the following distribution: X ~ N (25,16) . What is P [19 ! X ! 23] ? 2. You collect a random sample of n = 16 people. The average value of X in your sample is 91, and the standard deviation is 9. Construct a 90% confidence interval for the population average.

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Econ 400 Midterm 2, page 2 of 6.
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statsexam2f09 - Economic Statistics Exam 2 November 6 2009...

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