名校
1 . 下列说法中正确的有______ (填正确说法的序号).
①若样本数据
,
,…,
的方差为4,则数据
,
,…,
的标准差为4;
②已知随机变量
,且
,则
;
③若线性相关系数
越接近1,则两个变量的线性相关性越弱;
④若事件A,B满足
,
,
,则有
.
①若样本数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab84c3fe70da38ccb246fd4a71f9d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df223852f71d78270d8f719fac84770e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60191c0e64d94adc4f21ed712abc166c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad383e2adce07a351775afc721fa022a.png)
②已知随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90f12392733f7d31b5dadaa7ec2e190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/443445ab94fe4e1d8ec937d2d27123b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e96db41fa5017d4a665572da35a97bad.png)
③若线性相关系数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe9be2c6b3d8bf1e6ce9e9c0025ced7.png)
④若事件A,B满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2a3318f82fec39c53c0e4fea00f75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9561f0ed50a5e48d8642cc51264a4ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00c7901633320b672b30ec8ce2aa298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22c44a6bed4197c8d54a008e52827ff.png)
您最近一年使用:0次
2023-05-20更新
|
1018次组卷
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5卷引用:辽宁省沈阳市辽宁实验中学北校2023-2024学年高二下学期4月阶段测试数学试题
辽宁省沈阳市辽宁实验中学北校2023-2024学年高二下学期4月阶段测试数学试题吉林省延边朝鲜族自治州汪清县汪清第四中学2022-2023学年高二下学期期末数学试题(已下线)第八章 成对数据的统计分析(压轴题专练)-2023-2024学年高二数学单元速记·巧练(人教A版2019选择性必修第三册)上海市南洋模范中学2023届高三下学期3月模拟1数学试题(已下线)黄金卷04
名校
2 . 下列说法中,正确的有______ .
①回归直线
恒过点
,且至少过一个样本点;
②根据
列列联表中的数据计算得出
,而
,则有
的把握认为两个分类变量有关系,即有
的可能性使得“两个分类变量有关系”的推断出现错误;
③
是用来判断两个分类变量是否相关的随机变量,当
的值很小时可以推断两类变量不相关;
④某项测量结果
服从正态分布
,则
,则
.
①回归直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda105ec292aac7ab1485bd5031783fb.png)
②根据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9d7b638f9898764af4435e250d7956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e117d019a1a43f9655754a081164c1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c487ba8259608d3cb24fb594ffbd7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213c6487d477c3b399355b0df748a394.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f3af3f4d512364ec740e6ce12d75fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f3af3f4d512364ec740e6ce12d75fd.png)
④某项测量结果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0306ab7cad1530f99b9d6e1e01f7252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d018812218fe74569edec82f0c6c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059cbd1c6c15fb7ae69860ebc2d7f9cc.png)
您最近一年使用:0次
2020-04-11更新
|
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3卷引用:辽宁省沈阳市郊联体2019-2020学年高二下学期期中考试数学试题