quiz_05_20apr2011_solution

quiz_05_20apr2011_solution - Name: Assigned TF and Section...

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Unformatted text preview: Name: Assigned TF and Section time: Statistics 100 Quiz 5 Wednesday 20 April 2011 (25 total points) There are three problems on this quiz; the third is on the back page. Is the gestational age (time between conception and birth) of a low birth-weight baby useful in predicting head circumference at birth? Twenty-five (25) low birth-weight babies were studied at one of the Harvard teaching hospitals; the investigators calculated the regression of the response variable, head circumference ( y , measured in centimeters) against the predictor, gestational age ( x , measured in weeks). The estimated regression equation was y = 3 . 91 + 0 . 78 x. 1. (5 points) What is the predicted head circumference for a baby whose gestational age is 28 weeks? The predicted head circumference at 28 weeks is y = 3 . 91 + 0 . 78 x = 3 . 91 + 0 . 78(28) = 25 . 75 cm 2. (10 points) The standard error for the coefficient of gestational age is 0.35. Does the regression suggest that gestational age is significantly associated with head...
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This note was uploaded on 03/14/2012 for the course STATS 100 taught by Professor Grandal during the Spring '11 term at Harvard.

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quiz_05_20apr2011_solution - Name: Assigned TF and Section...

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