In the nichd early child care research network study researchers studied the impact of parenting on children's cognitive abilities, while taking into account the family income, mother's intelligence, and other variables. in this study, the researchers followed the same group of 700 children from age 6 months to first grade. this study relied upon a research design.

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: