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Ramey's study, children from poverty-level families IQ experiment

Description
In Ramey's study, children from poverty-level families were randomly assigned in infancy to an experimental group that received special daycare or to a control group, with the intervention lasting until age 5. At kindergarten, both groups entered public school. The difference in IQ between the experimental and control groups remained statistically significant even at age 12, seven years after the intervention had ended.
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