1 . 某公司调查了商品
的广告投入费用
(万元)与销售利润
(万元)的统计数据,如下表:
由表中的数据得线性回归方程为
.则
当时,销售利润
的估值为______ .
其中:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
由表中的数据得线性回归方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c9d44deafbbbb631c4c0db884c8874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
广告费用 | ||||
销售利润 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb59562a997df53f1a75567510e56b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
您最近一年使用:0次
名校
2 . 某公司调查了商品
的广告投入费用
(万元)与销售利润
(万元)的统计数据,如下表:
由表中的数据得线性回归方程为
,则当
时,销售利润
的估值为___ .(其中:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/688b14dfe2dda1306e29cadba2a4a88f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e42f8f84a31f60237b44e7eef98c6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0babd7f360a017f68e717fcc7ad8b5b1.png)
广告费用![]() | ![]() | ![]() | ![]() | ![]() |
销售利润![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fa894c1b82f5d0d8de708ef667003e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0babd7f360a017f68e717fcc7ad8b5b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d140365abfbdc1a4f1ee3afa3d0c47.png)
您最近一年使用:0次
2019-02-05更新
|
965次组卷
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3卷引用:【市级联考】广西钦州市2018-2019学年高二上学期期末考试数学(理)试题