ps6-answerkey - variable, so it should be treated as any...

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Answer Key to Problem Set 6 Fall 2005 Econ 3818-300 1 Answer Key to Problem Set 6 a. Schedule: Assigned Tuesday, 11 October. Due Tuesday, 18 October in class. b. Problems: 3.14, 3.18, 7.8, 8.2, 8.4 and 8.6 in "Statistics for Economics: An Intuitive Approach", by Allan S. Caniglia. ( Tips: For both 3-14 and 3-18, you need the Property 1, 2 and 3 on Page34-35. These three properties explain the relationship between x x s m , and y y s m , when variable y is a linear function in variable x) (Tips: This question ask you to find the relationship of y CV and x CV , which means you should write an equation of y CV in term of x CV )
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Answer Key to Problem Set 6 Fall 2005 Econ 3818-300 2 (Tips: The key thing for this question is that you have to be aware that E(x) is a constant, not a
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Unformatted text preview: variable, so it should be treated as any specific number in the proof. From step 2 to step 3 in the proof, first distribute the expectation to each term } )] ( {[ ] ) ( 2 [ ) ( )] ( [ ) ( 2 ( 2 2 2 2 x E E x x E E x E x E x x E x E--= +-. As E(x) is a constant, ) ( ) ( 2 ] ) ( 2 [ x E x E x x E E = , ( a constant can be taken out of the expectation) and 2 2 )] ( [ } )] ( {[ x E x E E = (expectation of a constant is equal to the constant itself, E(x)) Answer Key to Problem Set 6 Fall 2005 Econ 3818-300 3 Answer Key to Problem Set 6 Fall 2005 Econ 3818-300 4 Answer Key to Problem Set 6 Fall 2005 Econ 3818-300 5...
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ps6-answerkey - variable, so it should be treated as any...

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