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Quiz+2006+Answer+Key

# Quiz+2006+Answer+Key - Harvard ID Number API-202BCD Spring...

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Harvard ID Number: _____________________________________ API-202BCD Spring 2006 Quiz Answer Key 1. a. (2 points) In the regression results, which are reproduced below, circle and label 0 ˆ β and 1 ˆ β . ----------------------------------------- | Robust bwghtlbs | Coef. Std. Err. -------------+--------------------------- cigs | -.0321108 .0054833 _cons | 7.485744 .0359093 ----------------------------------------- b. (4 points) Explain (in words) the meaning of 1 ˆ β in this particular regression. An additional cigarette smoked per day during pregnancy is associated with a decrease in birthweight of 0.032 pounds Alternatively: Birthweight is predicted to decrease by 0.032 pounds, given an increase of 1 cigarette in the number of cigarettes smoked per day while pregnant. 2. (4 points) What is the predicted birth weight of a baby whose mother smoked 4 cigarettes per day during pregnancy? Show your work. SRF: cigs ghtlbs w birth 0321 . 0 4857 . 7 ˆ - = Predicted birthweight when cigs=4 is given by: ) 4 ( 0321 . 0 4857 . 7 ˆ - = ghtlbs w birth 3573 . 7 ˆ = ghtlbs w birth Hence, predicted birth weight of a baby whose mother smoked 4 cigarettes per day during pregnancy is 7.3573 pounds. 0

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Quiz+2006+Answer+Key - Harvard ID Number API-202BCD Spring...

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