已知
的取值如下表:
若依据表中数据所画的散点图中,所有样本点
都在曲线
附近波动,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![]() | 0 | 1, | 2 | 3 | 4 |
![]() | 1 | 1.3 | 3.2 | 5.6 | 8.9 |
若依据表中数据所画的散点图中,所有样本点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7dc08ac83b51b8d81c30ba74328bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77ef7a83adc30b6c58b4f4b7f8fd304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
A.1 | B.![]() | C.![]() | D.![]() |
更新时间:2020-07-14 22:09:29
|
【知识点】 根据样本中心点求参数
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【推荐1】一组样本数据:
,
,
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,由最小二乘法求得线性回归方程为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2368b2d5bf5fc67c771adb2b06d498.png)
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A.5 | B.6 | C.7 | D.8 |
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【推荐2】2020年4月,“一盔一带”安全守护行动在全国各地展开.某地交警部门加强执法管理期间,对某路口不带头盔的骑行者进行了统计,得到如下数据(其中
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | 1 | 2 | 4 | 8 |
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若
![](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/aeb1b2a483a62c5779ae060be336af48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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