statexam3sum08

statexam3sum08 - Statistics Exam 2 By writing your PID...

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Unformatted text preview: Statistics Exam 2 By writing your PID below, you are indicating June 16, 2008 your intention to abide by the honor pledge: PID: This exam contains twenty short answer questions ( worth 4 points each ) and four long answer questions ( worth 12 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 ] = e " # a f ( x ) = 1 u ! ! P [ X ] = μ x e ! μ X ! f ( x ) = ! e " ! x P [ X ] = N ! X !( N ! X )! p X (1 ! p ) N ! X Short Questions ( 4 points apiece ) 1. What does the “central limit theorem” tell us? 2. When creating a box- and- whisker plot, how do we determine the length of the whiskers? 3. Economic forecasters believe that there is a 0.6 chance that gasoline prices will rise throughout the summer, and there is a 0.5 chance that food prices increase. If these are independent events, what is the probability that both happen? 4. Economic forecasters believe that there is a 0.6 chance that gasoline prices will rise throughout the summer, and there is a 0.5 chance that food prices increase. If these are independent events, what is the probability that neither happens? 5. . You want to estimate the effect of x on y in Stata. You have data on these variables for 81 observations. You type reg y x . Among your output, you see: ------------------------------------------------------------------------------ y | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- x | 2.182247 1.253587 1.74 0.082 0....
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statexam3sum08 - Statistics Exam 2 By writing your PID...

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