期刊名称：International Journal of Education and Development using Information and Communication Technology
电子版ISSN：1814-0556
出版年度：2018
卷号：14
期号：3
页码：93-112
出版社：University of the West Indies
摘要：This study evaluates the impact of Khan Academy (KA) video tutorials in a blended learningenvironment for ninth grade students in Sri Lanka. The 632 treatment group students followed KAduring 2-3 out of 5 time slots assigned for mathematics teaching per week. Students in thecontrol group followed the regular class room environment with a mathematics teacher during all5 time slots. The impact of KA is evaluated based on students’ mathematics achievements inraw, standardized, and Item Response Theory adjusted scaled test scores using propensityscore matching. On average KA resulted in increasing students’ raw and scaled test scores by3.77 and 3.15 percentage points, respectively, and standardized test scores by 0.20 standarddeviations above the mean test score. The evaluation provides initial evidence that the use of KAwould help Sri Lankan students in mathematics. The findings are robust to alternativespecifications, where school and teacher inputs are controlled for in addition to students’characteristics, and when estimation is limited to the subsample of students that had a commonmathematics teacher across the treatment and the control groups.
关键词：Khan Academy; e;learning; Sri Lanka; impact evaluation
