quiz_05_20apr2011_solution

# quiz_05_20apr2011_solution - Name: Assigned TF and Section...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

## This note was uploaded on 03/14/2012 for the course STATS 100 taught by Professor Grandal during the Spring '11 term at Harvard.

### Page1 / 2

quiz_05_20apr2011_solution - Name: Assigned TF and Section...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online