1 . 某企业为确定下一年投入某种产品的研发费用,需了解年研发费用
(单位:千万元)对年销售量
(单位:千万件)的影响,统计了近10年投入的年研发费用
与年销售量
(
)的数据,得到散点图如图所示:
![](https://img.xkw.com/dksih/QBM/2021/7/20/2768244514111488/2789449267535872/STEM/286fa41b-ef50-4363-aac4-a1e784832aba.png?resizew=408)
(1)利用散点图判断,
和
(其中
,
为大于0的常数)哪一个更适合作为年研发费用
和年销售量
的回归方程类型(只要给出判断即可,不必说明理由).
(2)对数据作出如下处理:令
,
,得到相关统计量的值如下表:
根据(1)的判断结果及表中数据,求
关于
的回归方程;
(3)已知企业年利润
(单位:千万元)与
,
的关系为
(其中
),根据(2)的结果,要使得该企业下一年的年利润最大,预计下一年应投入多少研发费用?
附:对于一组数据
,
,
,
,其回归直线
的斜率和截距的最小二乘估计分别为
,
.
![](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/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70e0635d74c877367a9d586e462ef35.png)
![](https://img.xkw.com/dksih/QBM/2021/7/20/2768244514111488/2789449267535872/STEM/286fa41b-ef50-4363-aac4-a1e784832aba.png?resizew=408)
(1)利用散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7c4f1ac6cc57f6c5084479badd1f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)对数据作出如下处理:令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90229c4f76db5de308cf8d5fc382099b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c26fa1e573812fab6a173a4eb0ed38.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)已知企业年利润
![](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/4f66d3a55ac5924f52fefff6c450b267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2beb22b735da7cb8054dd722450632f5.png)
附:对于一组数据
![](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/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a14e40329de36fc4a1a3f8fbfafda12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0943f70585435955d528325e51ef013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d4301d6a4e03a2b43ed6a4c75c783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df06e95d5bd8a3b15d1e0e995c05eb8.png)
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2021-08-19更新
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4卷引用:安徽省黄山市屯溪第一中学2020-2021学年高二下学期期中文科数学试题