ProblemSet3 - Professor Mumford mumford@purdue.edu Econ 360...

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Professor Mumford Econ 360 - Fall 2010 mumford@purdue.edu Problem Set 3 Due at the beginning of class on Tuesday, September 14 Multiple Choice Questions (12 points) Suppose that a random sample of 200 male students is selected from Purdue’s student population. These mens’ weight (measured in pounds) is regressed on their height (measured in inches) with the following result: d weight = - 100 + 4 height n = 200 R 2 = . 8100 1. What is the predicted weight from this regression for someone who is 5’10” (70 inches) tall? (a) 380 (b) 280 (c) 200 (d) 180 2. Suppose that instead of measuring in pounds and inches, we measured in pounds and feet (5.833 feet instead of 70 inches). What would be the estimated intercept? (note that 12 inches = 1 foot) (a) -8.333 (b) -12 (c) -100 (d) -1200 3. Again, suppose that instead of measuring in pounds and inches, we measured in pounds and feet. What would be the estimated coeficient on height ? (a) 0.333 (b) 4 (c) 12 (d) 48 1
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4. Suppose that instead of measuring in pounds and inches, we measured in kilograms and inches. What would be the estimated intercept? (note that 1 pound = .454 kilograms) (a) -0.454 (b) -45.4 (c) -100 (d) -220.26 5. Again, suppose that instead of measuring in pounds and inches, we measured in kilo- grams and inches. What would be the estimated estimated coeficient on height ? (a) 0.454 (b) 1.816 (c) 4 (d) 8.811 6. Suppose that instead of measuring in pounds and inches, we measured in kilograms and feet. What would be the new R-squared? (a) 0.0675 (b) 0.2700 (c) 0.3677 (d) 0.8100 True/False (6 points) Please write the entire word. No explanations are required. 7. In the simple linear regression model, the homoskedasticity assumption means that the
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This note was uploaded on 02/06/2012 for the course ECON 360 taught by Professor Na during the Spring '10 term at Purdue University-West Lafayette.

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ProblemSet3 - Professor Mumford mumford@purdue.edu Econ 360...

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