Schools are the ideal setting for combining state health and education goals for all children. Children and adolescents spend more time in schools than in any other environment outside of their homes. They also form foundational health habits during their school years. By emphasizing school health and wellness, state leadership can support both…

This article provides practical guidance for researchers who are designing studies that randomize groups to measure the impacts of educational interventions. The article (a) provides new empirical information about the values of parameters that influence the precision of impact estimates (intraclass correlations and R[superscript 2] values) and…