Single-parent families. Examining data collected on 835 males from the National Youth Survey (a longitudinal survey of a random sample of U.S. households), researchers at Carnegie Mellon University found that 401 of the male youths were raised in a single-parent family (Sociological Methods & Research, Feb. 2001). Does this information allow you to conclude that more than 45% of male youths are raised in a single-parent family? Test at a = .05.