题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-10723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-60011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-56596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-69713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-13951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013739-97201.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013739-13152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013739-46188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013739-69781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013740-12382.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-56596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-69713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-10723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-60011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-10723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-60011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-56596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-69713.png)
则其中正确的结论是( )
A.①②④ | B.①②③ | C.①③④ | D.②③④ |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013740-68672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013740-12316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-13951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013739-97201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-56596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-69713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-10723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-60011.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-10723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-60011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-56596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-69713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013740-12436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013741-68541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-10723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013738-60011.png)
核心考点
举一反三
(1)用相关指数
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013730-88370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013730-88370.png)
(2)将一组数据中的每个数据都加上或减去同一个
常数后,方差恒不变;
(3)设随机变量
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013730-49774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013730-99946.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013731-46953.png)
(4)回归直线一定过样本中心点
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013731-31316.png)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013724-12489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013724-81868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013725-27251.png)
充分不必要条件 B.必要而不充分条件
C.充要条件 D.既不充分也不必要条件
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013720-78384.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013720-74433.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013720-48863.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013720-69944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013721-73424.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013721-74476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013712-22122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013713-87024.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013702-23580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013702-34369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013702-86067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013702-94890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013703-13996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013703-71888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013703-16891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013703-20193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013704-86120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013704-50756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013704-63616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013705-98020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013705-90892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103013705-31860.png)
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