Researchers investigating the impact of prenatal care on newborn health collected data from 866 births during 1997-1999. They kept track of the mother's age, the number of weeks the pregnancy lasted, the type of birth (cesarean, induced, natural), the level of prenatal care the mother had (none, minimal, adequate), the weight and sex of the infant, and whether the infant exhibited health problems (none, minor, major). Identify the sample.   The newborn health of the 866 infants   The 866 births   The 866 mothers   The health problems in the newborn health of the 866 infants.

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