15A+Practice+Test+2B

# 15A+Practice+Test+2B - 1-2. For the following data, the...

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1-2. For the following data, the regression line is Y-hat = -0.4 + 0.52X. Please calculate the SEE without calculating the correlation coefficient. (This question is worth 20 points. It counts as two questions. It is worth 20 points not because of its relative importance, but rather the time it takes to answer.) X Y 9 3 17 7 21 15 33 15 3-4. Now use the same data and calculate the correlation coefficient (without using the SEE). (This question is worth 20 points. It counts as two questions.) 5. Let’s look at three equations: WT = a 1 + b 1 HT WT = a 1 + b 2 MALE WT = a 1 + b 3 HT + b 4 MALE Explain why b 1 is larger than b 3 . You need to explain what additional effect b 1 is measuring. If you ever use the words “holding … constant” you are probably answering in the wrong way. 6. True or false and explain briefly: If the correlation coefficient is –0.80, then below average values of the dependent variable are associated with below average values of the independent variable. 7. What is meant by Ordinary Least Squares?

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## This note was uploaded on 12/12/2010 for the course ECON ECON 15A taught by Professor Rajendram.patel during the Fall '10 term at UC Irvine.

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15A+Practice+Test+2B - 1-2. For the following data, the...

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