What the Evidence for Learning by Doing Measures: Classroom Meta-Analyses, ICAP, and the Doer Effect
College-classroom meta-analyses find about half a standard deviation, but they compare whole-course teaching formats, the active sections usually include group discussion and instructor responses, and most controls were not done or not reported. In online courseware, "students who do more practice score higher on quizzes" recurs across a dozen-plus courses, but all of it is observational. None of the studies read here compared one person reading an article with and without practice.