There is a relationship between missed school days and a dip in student test scores, according to a study by University of Maryland researchers, who found in studying 20 years of data that "in a year with five lost school days, the number of third-graders who met state proficiency targets was 3% lower than in years with no school closings." Researchers also said the amount of time students spend engaged in lessons -- not just in the classroom -- affects student achievement.

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