5. At a hospital, data is recorded on the gestational age at birth (measured in weeks) and the birth weight (measured in grams) of newborn babies. Suppose that for a sample of these babies, the relationship between gestational age and birth weight is linear, with a correlation of r = 0.82. If a regression equation is constructed based on this data in order to predict birth weight based on gestational age, we know that approximately ______of the variability in birth weight can be explained by the regression equation. A. 67% B. 41% C. 82% D. 91% E. 1.6%