Unverified50% confidenceFactExact time
经济学家埃里克·布林约尔森的研究发现优质私人教师能让学生成绩提升两个标准差（'2 Sigma问题'）
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5/22/2026
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UnverifiedBloom's classic 1984 study on the '2 Sigma Problem' proved that one-on-one tutoring can improve student performance by an average of two standard deviations.77% similarUnverifiedBloom的研究发现个性化辅导效果比传统教学高出约两个标准差，被称为2-sigma问题，优秀学生比例可从约20%提升至80%以上67% similarUnverified1984年本杰明·布鲁姆在《教育研究者》期刊发表论文，发现接受一对一辅导的学生表现平均比传统课堂高出约两个标准差67% similarUnverifiedVygotsky's zone of proximal development theory points out that learners can solve problems beyond their independent capabilities with the assistance of peers or mentors.62% similar
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