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五正态分布社会计统学原理五正态分布社会计统学原理五正态分布社会计统学原理
1
第六讲:正态分布
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2
学习目标
掌握正态分布的特性;
正态分布曲线下面积的含义;
标准分的计算和应用;
利用标准正态分布表计算概率。
理解大数定理和中心极限定理
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3
一、什么是正态分布?
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4
从 “分布” 说起
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5
☆直方图——用长条的面积来表示频次或相对频次;
☆折线图——用直线连接直方图中条形顶端的中点;
当组距逐渐减小时,折线将逐渐平滑为曲线。
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6
峰点(Peak)研究
单峰
多峰
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7
几种常见的频数分布曲线
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8
一、 正态分布曲线
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Ev
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