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 model output is also provided below. Std. Error t value Pr(> [t]) (Intercept) gestational age 0.78 Estimate 3.91 0.0347 149.23 0.0000 0.35 2.23 0.0358