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初中数学教材上所介绍的方差知识比较抽象,难于理解,如果在学习时辅助以图像, 便会豁然开朗,现说明如下．一、方差的作用用来衡量一组数据波动的大小．这里的“波动”对于初学者来说就很难理
The variance knowledge introduced in junior high school mathematics textbooks is relatively abstract and difficult to understand. If you assist in using images during learning, you will suddenly see the light. 1. The role of variance is used to measure the size of a set of data fluctuations. The “fluctuation” here is difficult for beginners