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五级量表算出4.35分,对课程评价没有意义——等级数据不该被当等距数据使用

很多课程问卷都在做同一件事:让学生对「老师讲课清晰」打1–5分(非常不同意到非常同意),然后算平均分——4.35,比另一位老师的4.21高0.14。于是这位老师被判定为教学更好。这个流程从头到尾建立在两个未经检验的假设上:五个等级之间的距离相等,以及平均数对等级数据合法。…

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