Question: 8.36 Babies. Is the gestational age (time between conception and birth) of a low birth-weight baby useful in predicting head circumference at birth? Twenty-five

8.36 Babies. Is the gestational age (time between conception and birth) of

8.36 Babies. Is the gestational age (time between conception and birth) of a low birth-weight baby useful in predicting head circumference at birth? Twenty-five low birth-weight babies were studied at a Harvard teaching hospital; the investigators calculated the regression of head circumference (measured in centimeters) against gestational age (measured in weeks). The estimated regression line is head circumference = 3.91 +0.78 x gestational age (a) What is the predicted head circumference for a baby whose gestational age is 28 weeks? (b) The standard error for the coefficient of gestational age is 0. 35, which is associated with df = 23. Does the model provide strong evidence that gestational age is significantly associated with head circumfer- ence?

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