Abstract
Evidence on the effect of extending the school day is decidedly mixed because of the stark differences in how schools use additional time. In this paper, I focus narrowly on the effect of additional time used for individualized tutorials. In 2005, MATCH Charter Public High School integrated two hours of tutorials throughout an extended day. The unanticipated implementation of this initiative and the school's admissions lottery allow me to use two complementary quasi-experimental methods to estimate program effects. I find that providing students with daily tutorials that are integrated into the school day and taught by full-time, recent college graduates increased achievement on tenth-grade English language arts exams by 0.15–0.25 standard deviations per year. I find no average effect in mathematics beyond the large gains students were already achieving, although quantile regression estimates suggest the tutorials raised the lowest end of the achievement distribution in mathematics.
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