在线辅导行之有效：一项面向弱势儿童项目的实验证据

中文摘要

我们通过一项随机对照试验，为一种新型、100%全程在线数学辅导项目的有效性提供了证据，该项目面向来自高度弱势社区的中学生。这项为期八周的高强度项目在课后时间以每组两名学生的形式开展，授课者大多为具备资质的数学教师。该干预显著提高了标准化考试成绩（+0.26个标准差）和学年末数学成绩（+0.49个标准差），同时降低了留级概率。该干预还提升了学生的抱负以及其自我报告的在校努力程度。二对一的设计使我们能够显著降低成本并提高可扩展性，同时取得与一对一辅导项目相近的成效。

Abstract

We provide evidence from a randomized controlled trial on the effectiveness of a novel, 100-percent online math tutoring program, targeted at secondary school students from highly disadvantaged neighborhoods. The intensive, eight-week-long program was delivered in groups of two students during after-school hours, mostly by qualified math teachers. The intervention significantly increased standardized test scores (+0.26 SD) and end-of-year math grades (+0.49 SD), while reducing the probability of repeating the school year. The intervention also raised aspirations, as well as self-reported effort at school. The two-on-one design allows us to significantly reduce costs and improve scalability, while showing similar results as one-on-one tutoring programs.