Final answer:
Children raised by single-parent fathers have received more research attention compared to children raised by single-mothers.
Step-by-step explanation:
The question asks which group of children has more research done on them: children raised by single-parent fathers or children raised by single-mothers. According to the information provided, children raised by single-parent fathers have more research done on them. The U.S. Census statistics show that children living with divorced fathers typically have more advantages than children living with a parent who never married. The statistics also indicate that children raised by single mothers are more likely to live near or below the poverty level. These findings suggest that more research has been conducted on children raised by single-parent fathers.