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Unformatted text preview: Midterm 2  Spring 2010  Form A Economics 203 Instructors: Petry and Sahakyan Name: Before beginning the exam, please verify that you have 16 pages with 43 questions in your exam booklet. You should also have a decisiontree and formula sheet provided to you. Please include your full name and NetID on your bubble sheets. Based on the name of your TA and discussion time, please code in the following for the “Section” portion on your scantron: TA Name Discussion Day and Time Section Josh Brown Thursday 9am 001 Josh Brown Thursday 10am 002 Josh Brown Thursday 11am 003 Rafael Ribas Thursday 12pm 004 Rafael Ribas Thursday 1pm 005 Rafael Ribas Thursday 2pm 006 Andreas Hagemann Friday 8am 007 Andreas Hagemann Friday 9am 008 Andreas Hagemann Friday 10am 009 Sergey Popov Friday 11am 010 Sergey Popov Friday 12pm 011 Sergey Popov Friday 1pm 012 Esra Ergul Friday 11am 013 Esra Ergul Friday 12pm 014 Esra Ergul Friday 1pm 015 Lusha Zhu Friday 2pm 016 Lusha Zhu Friday 3pm 017 Lusha Zhu Friday 4pm 018 Good luck! 1. Which of the following statements best describes positive autocorrelation? a. The distribution of the residuals is skewed, so that it does not resemble a bellshaped curve b. Consecutive residuals are likely to have the same sign, either both positive, or both negative c. Consecutive residuals are likely to have the opposite sign, one positive and one negative d. The absolute size of the residuals is related to the value of the dependent variable e. Two or more of the independent variables have a high correlation 2. The value of R 2 for your linear model is 0, with n=50, k=4, and SST=50,000. What is the value of the Fstatistic? a. Unknown; need parameter values. b. Unknown; need SSE and SST. c. Unknown; need amount of variables. d. 0. e. + ∞ . 1 Use the following information to answer the next 3 questions (35): Your boss at the local liquor store tells you that the sales of bottles of wine are directly related to the amount of shelf space allocated to it. He claims that as the amount of shelf space (as measured by the width of the display, in number of bottles) increases, so do sales. You decide to test this theory by varying the shelf space of your favorite bottle over the course of ten weeks, and measuring the sales each week. Here is your Excel output: Regression Statistics Multiple R 0.899025819 R Square 0.808247423 Adjusted R Square 0.784278351 Standard Error 3.234578798 Observations 10 Coefficients Standard Error t Stat Pvalue Intercept 8.7 3.068590882 2.835177557 0.021974 Shelf Space 4.2 0.723273807 5.80692949 0.000402 3. With the above output, what is the hypothesis test related to the pvalue of 0.000402? a. H : β 1 = 0 vs. H 1 : β 1 6 = 0 b. H : β 1 = 0 vs. H 1 : β 1 > c. H : b = 0 vs. H 1 : b 6 = 0 d. H : b 1 = 0 vs. H 1 : b 1 6 = 0 e. H : β = 0 vs. H 1 : β 6 = 0 4. What is the pvalue for testing your boss’s claim?...
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 Spring '09
 PETRY
 Economics, Regression Analysis, Standard Error, Null hypothesis

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