名校
解题方法
1 . 某服装公司对1-5月份的服装销量进行了统计,结果如下:
若
与
线性相关,其线性回归方程为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
月份编号![]() | 1 | 2 | 3 | 4 | 5 |
销量![]() | 50 | ![]() | 142 | 185 | 227 |
![](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/7b88f54b6b44d47b2742873c0ebee276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
您最近一年使用:0次
2023-03-07更新
|
464次组卷
|
6卷引用:吉林省辽源市田家炳高级中学校友好学校2022-2023学年高一下学期期末联考数学试题
2 . 已知一组观测值(xi,yi),(i=1,2,…,n),作出散点图后,确定它们具有线性相关关系,设其回归方程为
=
x+
,求得
=10,
=2,
=0.5,则
=____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3617671ab9daae844ca0a46066fe7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0032ca31e3cba58f973c6e75b907fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb525270c748eddaaecc4a549cca250e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0032ca31e3cba58f973c6e75b907fb1.png)
您最近一年使用:0次
3 . 两变量x,y具有相关关系,根据样本数据计算得出回归方程是
,已知样本数据两变量的均值分别为
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af8d0940da9f7a1f84f05d0d55cdedb.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1882d2f789de61b5b7e3ec952e13b99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb525270c748eddaaecc4a549cca250e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af8d0940da9f7a1f84f05d0d55cdedb.png)
您最近一年使用:0次
4 .
地区干旱少雨、日照时间长、无霜期长、昼夜温差大,非常适宜农作物尤其是棉花的生长.下表是
地区2016-2020年的棉花产量数据,根据表中数据求得
关于
的回归方程为
,则以下说法正确的有___________ (把所有正确说法的编号都填上).
①棉花产量与时间成正相关;②
;③2021年的产量一定是
万吨;④该回直线过点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d841cce07d7d674feb673cd75d535b26.png)
①棉花产量与时间成正相关;②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1e0d16ef3b67fefe21fd739c0e3195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af65fb78068846eab343380dea237556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c9f7bfb03cec28861f0d5c5e7025eb.png)
![]() | |||||
年份 | 2016 | 2017 | 2018 | 2019 | 2020 |
时间代号![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
产量![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
您最近一年使用:0次
名校
5 . 某商家统计,甲产品以往的先进技术投入
(千元)与月产利润
(千元)
的数据可以用函数
来拟合,且
,
,其中
,
,
,预测先进生产技术投入为64千元时,甲产品的月产利润大约为______ 千元.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9fbb31b5eddea47a9c45d4f6263bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36119dc4e4fb5984f9b4588d350d955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7bf58445d02cefc4c9a78780369ced6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad0fbf3be68978802d8d569ac7dbc58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b3825df1410aca7b7b7345d9ca8711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/755147a8d871d34c1e8f80e6771bd115.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53ce494f0cf2893458f82212c24a7e1.png)
您最近一年使用:0次
2021-04-28更新
|
351次组卷
|
2卷引用:河南省驻马店市新蔡县第一高级中学2020-2021学年高一下学期5月月考数学试题