在一次实验中,测得
,
的值如表:
则
与
之间的回归直线方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
1 | 2 | 3 | 4 | |
4 | 7 | 10 | 13 |
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
18-19高三上·黑龙江七台河·期末 查看更多[2]
更新时间:2018-01-18 23:29:07
|
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较易
(0.85)
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解题方法
【推荐1】小明同学根据下表记录的产量
(吨)与能耗
(吨标准煤)对应的四组数据,用最小二乘法求出了
关于
的线性回归方程
,据此模型预报产量为7万吨时能耗为( )
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fcd0a3820e4ee462c55029ad3f8f58e.png)
产量![]() | 3 | 4 | 5 | 6 |
能耗![]() | 2.5 | 3 | 4 | 4.5 |
A.5 | B.5.25 | C.5.5 | D.5.75 |
您最近一年使用:0次
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较易
(0.85)
名校
【推荐2】某种产品的广告费支出
与销售额
(单位:百万元)之间有如下对应数据:
根据上表提供的数据,求出
关于
的回归直线方程为
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
2 | 4 | 5 | 6 | 8 | |
30 | 40 | 50 | 70 |
根据上表提供的数据,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fcf97e713b55785feaafd9fd36f66f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
A.40 | B.50 | C.60 | D.70 |
您最近一年使用:0次