The future of preschool Does preschool help low income children stay in school and hold good jobs later in life? The Carolina Abecedarian Project (the name suggests the ABCs) has followed a group of 111 children since 1972. Back then, these individuals were all healthy , low- income black infants in Chapel Hill, North Carolina . All the infants received nutritional supplements and help from social workers. Half were also assigned at random to an intensive preschool program. (A) Describe how the researchers could have carried out the random assignment
(B) Why was it important that the researchers randomly assigned treatments to the children?
(C) Identify one variable that the researchers kept the same for all subjects. Why was it important that the researchers kept this variable the same?