名校
解题方法
1 . 爱心蔬菜超市为确定某种蔬菜的日进货量,需了解日销量
(单位:
)随上市天数
的变化规律.工作人员记录了该蔬菜上市10天来的日销量
与上市天数
的对应数据,并对数据做了初步处理,得到如图的散点图及一些统计量的值:
表中
.
![](https://img.xkw.com/dksih/QBM/2020/7/30/2516883991781376/2519755854716928/STEM/0855c7d3-2259-4c02-a917-36797cce1970.png)
(1)根据散点图判断
与
哪一个更适合作为日销量
关于上市天数
的回归方程(给出判断即可,不必说明理由)?
(2)根据(1)中的判断结果及表中数据,求日销量
关于上市天数的回归方程,并预报上市第12天的日销量.
附:①
,
.
②对于一组数据
,
,…,
,其回归直线
中的斜率和截距的最小二乘估计分别为:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f7c4a8558eff6427d22b6c0c855721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119cb8f4d1f7024e9e65017032b7ea93.png)
55 | 155.5 | 15.1 | 82.5 | 4.84 | 94.9 | 24.2 |
表中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3139206ed233ec8cc4efdcd68857616c.png)
![](https://img.xkw.com/dksih/QBM/2020/7/30/2516883991781376/2519755854716928/STEM/0855c7d3-2259-4c02-a917-36797cce1970.png)
(1)根据散点图判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fe88001dda925936ab7b8186c479e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)根据(1)中的判断结果及表中数据,求日销量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
附:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12a76edbb3e98e3ff41c03401769d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50101047632b94dcd5cf8035b093cc5.png)
②对于一组数据
![](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/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9218b61bbc7b5304adf61be07f0a98ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
您最近一年使用:0次
2020-08-03更新
|
1629次组卷
|
8卷引用:山东省聊城市2019—2020学年度高二下学期期末教学质量抽测数学试题
2019高二下·全国·专题练习
2 . 为研究质量
(单位:克)对弹簧长度
(单位:厘米)的影响,对不同质量的6个物体进行测量,数据如表所示:
(1)作出散点图并求线性回归方程;
(2)求出
;
(3)进行残差分析.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | 5 | 10 | 15 | 20 | 25 | 30 |
![]() | 7.25 | 8.12 | 8.95 | 9.90 | 10.9 | 11.8 |
(2)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
(3)进行残差分析.
您最近一年使用:0次