A researcher who knew the director of a natural birthing facility interviewed 100 women who were planning to give birth at the center. Specifically, the researcher interviewed the mothers-to-be during their 6-month checkups at the birthing center. She asked the mothers-to-be if they planned to breastfeed their infants until the infants were at least 1 year of age. Imagine that exactly 90% of the 100 mothers-to-be who were interviewed answered that they planned to do so. Using the OOPS! heuristic as a guide, explain why the researcher cannot safely conclude that 90% of American mothers today do, in fact, breastfeed their infants for the first year of life.