关于某设备的使且年限
与所支出的维修费用
(万元)有如下统计资料:
若
对
呈线性相关关系,则线性回归方程
表示的直线一定过定点____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
使用年限![]() | 2 | 3 | 4 | 5 | 6 |
维修费用![]() | 2.2 | 3.8 | 5.5 | 6.5 | 7.0 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2012/1/27/1570698147414016/1570698152665088/STEM/39320d1a81a7487a9a2ddfc42db35377.png?resizew=76)
12-13高二上·黑龙江牡丹江·期末 查看更多[1]
(已下线)2011-2012学年黑龙江省牡丹江一中高二上学期期末考试理科数学
更新时间:2012-01-27 09:54:16
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【知识点】 计算样本的中心点
相似题推荐
填空题-单空题
|
较易
(0.85)
名校
【推荐1】已知呈线性相关的变量
与
的部分数据如表所示:若其回归直线方程是
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624adf9a71e4587f2b549614e183b032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![]() | 2.8 | 4.4 | 5 | 5.6 | 7.2 |
![]() | 3.5 | 5.5 | ![]() | 7 | 8 |
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐2】对具有线性相关关系的变量
,
,有一组观察数据
,其回归直线方程是:
,且
,
,则实数
的值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2f3dfe544164fdf96f70f3ced814ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2cec3208f0bdeccf547328f014f4b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023d1e74c8083243de85b2d26d4541fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b46ab602b4e1f7fad83c185eadca96fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次