A researcher studied the effects of a preschool enrichment program on the IQ of children starting at 2,3,or 4 years of age.Each age group was assessed at the end of the first year of the program for short-term effects and then again 5 years later for long-term effects.Which research design does this study exemplify?

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The Answer of A researcher studied the effects of a preschool enrichment program on the IQ of children starting at 2,3,or 4 years of age.Each age group was assessed at the end of the first year of the program for short-term effects and then again 5 years later for long-term effects.Which research design does this study exemplify?

A Researcher Studied the Effects of a Preschool Enrichment Program