1. A hypothetical regression equation may be:

headcirc (cm) = 8.31 + 0.45 (gestational age - weeks) + 4.71 (birthweight - kg)

A) Predict the average head circumference a 30-week old birth weighing 1.1 kg (round to nearest whole number) : ........cm B) Predict the average head circumference a 27-week old birth weighing 0.8 kg (round to nearest whole number) : .........cm

C) If the birthweight of two babies is identical, predict the difference in head circumference if the gestational age differs by two weeks (to one decimal place)?: .......cm