2021年10月26日国务院印发《2030年前碳达峰行动方案》,要求我国二氧化碳排放力争于2030年前达到峰值.低碳生活已经深入民心,新能源汽车备受欢迎,下表是某地区近5个月新能源汽车的销售量统计表:
若根据表中数据求得的x与y的线性回归方程为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57fa7223998561b2a28cfbeb11e54bb.png)
________ .
月份代号x | 1 | 2 | 3 | 4 | 5 |
销售量y(万辆) | 0.4 | 0.6 | 0.9 | 1.2 | 1.4 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b192ee75aaa15e33de30a9ff08eb95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57fa7223998561b2a28cfbeb11e54bb.png)
更新时间:2022-05-31 16:46:54
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【知识点】 根据样本中心点求参数
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【推荐1】对具有线性相关关系的变量x,y有一组观测数据![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1b7006c6e238682418849243d0b891.png)
,其回归直线方程是
,且
,
,则实数
的值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1b7006c6e238682418849243d0b891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93fc0f69b5e44f76d1c46e7f20509d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c3fa21ec8449c53880ed817cd1f798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2707cddf96c0b28f2b81b4deef1a8ddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc24cdca43c3c7530a8cd7504aea7f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
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填空题-单空题
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容易
(0.94)
【推荐2】由一组观测数据
,
,…,
得回归直线方程为
,若
,
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ba7d9690eed32932bc19c1eb9eebe3.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56720e2f2b0ddd72156da495923698da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2852ae85cfcc804b3192ea8543c88938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92abae836b8026511113ad8c3ea23028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc4ad983a0fb6ece6294968a10db6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0264d8d0f6723e407e358fd48eb5b912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5385d78d4670ac260792a1d00e1d43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ba7d9690eed32932bc19c1eb9eebe3.png)
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