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解题方法
1 . 某新能源汽车公司从2018年到2022年汽车年销售量y(单位:万辆)的散点图如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/87d99562-638a-4dbb-9dd3-f4e3bda26b7e.png?resizew=248)
记年份代码为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e1ba33c5765ebb03b29545e3151ae7.png)
(1)根据散点图判断,模型①
与模型②
,哪一个更适宜作为年销售量y关于年份代码x的回归方程?(给出判断即可,不必说明理由)
(2)根据(1)的判断结果,建立y关于x的回归方程.
参考数据:
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/87d99562-638a-4dbb-9dd3-f4e3bda26b7e.png?resizew=248)
记年份代码为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e1ba33c5765ebb03b29545e3151ae7.png)
(1)根据散点图判断,模型①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5b75998316104f379d131d55957ff1.png)
(2)根据(1)的判断结果,建立y关于x的回归方程.
参考数据:
![]() | ![]() | ![]() | ![]() | ![]() |
34 | 55 | 979 | 657 | 2805 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5acddf4448b6f92c0599500e859917a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05efc1e2d66325c53f2b8a0cc6d3d38d.png)
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名校
2 . 一只昆虫的产卵数
与温度
有关,现收集了6组观测数据与下表中.由散点图可以发现样本点分布在某一指数函数曲线
的周围.
令
,经计算有:
(1)试建立
关于
的回归直线方程并写出
关于
的回归方程
.
(2)若通过人工培育且培育成本
与温度
和产卵数
的关系为
(单位:万元),则当温度为多少时,培育成本最小?
注:对于一组具有线性相关关系的数据
,
,…,
,其回归直线
的斜率和截距的最小二乘公式分别为
,
.
![](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/a1f46b59aad308a47229770c8bf1f2f9.png)
温度 | 21 | 23 | 25 | 27 | 29 | 31 |
产卵数 | 7 | 11 | 21 | 24 | 66 | 114 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54d28162b2a8309f0f7f193e733be414.png)
26 | 40.5 | 19.50 | 6928 | 526.60 | 70 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f46b59aad308a47229770c8bf1f2f9.png)
(2)若通过人工培育且培育成本
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.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/bb9e2fd7352802bfead36ba73ec886a0.png)
注:对于一组具有线性相关关系的数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1c6aadc0129bf86f4fff9dcfb924b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154100371e025fffe0ffae8be9567383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a14e40329de36fc4a1a3f8fbfafda12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b398b4ecaf55a04fc5c5d5c60125b16a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db573679e8238ee86e06b2080a55da70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c694b32bc1dcc9cccc62f4aba80d45b.png)
您最近一年使用:0次
2020-01-30更新
|
488次组卷
|
4卷引用:内蒙古自治区呼和浩特市第二中学2023-2024学年高二下学期4月月考数学试题
名校
3 . 在一次抽样调查中测得样本的5个样本点,数据如下表:
(1)作出散点图.
(2)根据散点图判断,
与
哪一个更适合
与
的回归方程.
(3)根据下面表格中的数据,建立
与
的回归方程.
令
![]() | 0.25 | 0.5 | 1 | 2 | 4 |
![]() | 16 | 12 | 5 | 2 | 1 |
(2)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b5324645d81b339fa25ccb2951f77e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d795facf833b682c6bc1a86ef5ba26d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)根据下面表格中的数据,建立
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | ![]() | ![]() | ![]() | ![]() |
1.55 | 7.2 | 94.25 | 21.31 | 430 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1334f4e51de258a682592466226d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96f44674d411a622d4935faf0699fd15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf2bce71f6f8dc461eb5b3ab10905759.png)
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