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A comment on The Most Common Errors in Undergraduate Mathematics (2009). Parent comment

Re:The Most Common Errors in Undergraduate Mathematics (2009) by hyperpallium2 on Thursday November 19, 2020 @12:15PM (#25151675)
https://wikipedia.org/wiki/Bloom's_2_sigma_problem

  the average student tutored one-to-one using mastery learning techniques performed two standard deviations better
A tutor can notice gaps. You can't.
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