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「听懂了吗?」是一份 kappa≈0 的问卷:课堂反馈的高一致陷阱

【锚点】这一篇只钉一个判断:【课堂上「懂了吗 → 懂了」的一致率可以接近 96%,而它对「学员是否真的能迁移」几乎零信息量;因为边际分布被「懂了」这一档挤满,一致性是边际分布的产物,不是学习发生的证据。】 【显式】摆一个具体的 2×2:100 人课堂,后测 98 人通过;教师问「懂了吗」,98 人举手「懂」;两者一致 96 人。一致率 = 96%。代入 kappa:pe = (98×98 +…

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