A sociologist randomly selects 371 females 15 to 19 years old and asks each to disclose her family structure at age 14 and whether she has had sexual intercourse.

Had sexual intercourse Both Biological or Adoptive Parents Single Parent Parent and Nonparenlal Guardian Stepparent 53 42 63 30 Yes 52.02 40.06 76.47 24.45 42 35 a4 17 NO 47.98 36.94 70.53 22.55