已知某企业上半年前5个月产品广告投入与利润额统计,如下:
月份 | 1 | 2 | 3 | 4 | 5 |
广告投入(x万元) | 9.5 | 9.3 | 9.1 | 8.9 | 9.7 |
利润(y万元) | 92 | 89 | 89 | 87 | 93 |
由此所得回归方程为,若6月份广告投入10万元,估计所获得利润为
22-23高三·全国·对口高考 查看更多[3]
北京名校2023届高三一轮总复习 第9章 统计与概率 9.3 变量的相关性与回归分析四川省蓬溪中学校2022-2023学年高二下学期月考(文科)数学试题(已下线)8.2 一元线性回归模型及其应用(分层练习,7大题型)-2023-2024学年高二数学同步精品课堂(人教A版2019选择性必修第三册)
更新时间:2023-06-06 09:16:02
|
相似题推荐
填空题-单空题
|
容易
(0.94)
【推荐1】已知
,
是两个具有线性相关的两个变量,其取值如下表:
其回归直线
过点
,则
,
满足的条件是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
1 | 2 | 3 | 4 | 5 | |
4 | 9 | 11 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fa8c0382d087631a601381ff001aed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
名校
【推荐2】一组样本数据:
,
,
,
,
,由最小二乘法求得线性回归方程为
,若
,则实数a的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf19d032c053b8e25d2d0667f8a32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d982eba6ef4f90828c1c1d568e99e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2efdae8486fcc40c75d750ca756a3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2db03e2a02fc11e1431c79f6be84264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ae5c6fd3bd7efec15b8217ed1eeca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1981861277590d484e80218f5bfdd43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7f5abe1fcf781c912a65bb528dcceb.png)
您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
名校
【推荐1】商场对某种产品的广告费用支出
(元)与销售额
(元)之间的关系进行调查,通过回归分析,求得
与
之间的关系式为
,则当广告费用支出为10元时,销售额
的预报值为__________ .
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2290e5cd88fbd0d766c7628e1e5de19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
【推荐2】给出以下命题:
① 双曲线
的渐近线方程为
;
② 命题
“
,
”是真命题;
③ 已知线性回归方程为
,当变量
增加
个单位,其预报值平均增加
个单位;
④ 设随机变量
服从正态分布
,若
,则
;
⑤ 已知
,
,
,
,依照以上各式的规律,得到一般性的等式为
,(
)
则正确命题的序号为________________ (写出所有正确命题的序号).
① 双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acca1c00ee33a8d7aabf1d626541259e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95b60de1f6993edd7275bcf8b9527dd.png)
② 命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7eb222c30d40a968d6667b2d449bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a264a1aa04dde67e2e78100945e09e1.png)
③ 已知线性回归方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8a20de7a89ee822d3e55db1205cef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
④ 设随机变量
![](https://img.xkw.com/dksih/QBM/2013/5/5/1571206609248256/1571206614810624/STEM/9ac78b8cd0d64613961dc9e7d9b3c3a8.png?resizew=13)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcadfe766e5ce650c693bb394fb7473d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263ce586145227444e4ec3e4a90fa6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6a96069c523416157f629f3c364cea.png)
⑤ 已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41dfdce938211349a4a8ca38eea07d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00664e3d1e38b11620ec99cb53e12100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aad616036618921c5721d2c3ef74bb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab13d30a44b3224235914ed84f3453b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19fc7c5ab1e956d3c9a5aae548e2fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acedd683a7c98c2952785e4ac1df4785.png)
则正确命题的序号为
您最近一年使用:0次