版选修2_3.ppt

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第三章 统计案例,31 回归分析的基本思想及其初步应用,第三章 统计案例,相关关系,画出两个变量的散点图,求回归直线方程,样本点的中心,随机误差,解释,预报,接近于1,比较均匀,越窄,小,

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