Data was gathered from a random sample of young mothers between the ages of 15 and 19 years, and the relationship between the mother's age (measured in years) and the baby's birth weight (measured in grams) was observed to be linear, with r = 0.88. Further, the regression equation to predict a baby's birth weight based on the mother's age was found to be: Predicted birth weight = -1163.45 + 245.15(age). Based on this;

Because r is less than 1, we would consider the relationship between mother's age and baby's birth weight to be weak.

If we switch the variables so that age is the response variable and birth weight is the explanatory variable, r would still be 0.88.

If a mother's age is 25 years, we would not want to use the regression equation to predict the baby's birth weight since this would be considered extrapolation.

If weight was measured in pounds instead of grams, the value of r would still be 0.88.

The predicted birth weight for a baby whose mother is 16 years old is 2758.95 grams.