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The Unreasonable, Irreplaceable Effectiveness of One-on-One

Statisticians who study education talk in terms of effect sizes, or standardized units. In education research, effect sizes of 0.2, or two tenths of a standardized unit (in response to a treatment), attract considerable attention.  Many prominent professors report effect sizes of 0.1 or even 0.05.  The early childhood interventions that President Obama touted had

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