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1984幎ã®å®éšå®€ïŒã·ã«ãŽå€§åŠæè²åŠç§
ãã³ãžã£ãã³ã»ãã«ãŒã ïŒBenjamin S. BloomïŒã¯1984幎ã«åŠè¡èªEducational Researcherã«çºè¡šããè«æãThe 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoringãã§ãç°¡æœãããç Žå£çãªå®éšçµæãå ¬éããŸããã圌ã¯åãåŠç¿å 容ã3ã€ã®æ¹åŒã§æããæã«çåŸã®ææãã©ãã»ã©å€ããããæž¬å®ããŸããã
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"The tutored students' average achievement was about two standard deviations above the conventionally taught students, with as many as 90 percent of the tutored students exceeding the average achievement of the conventionally taught students."
â Bloom, 1984, p. 4
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