某公司为确定下一年度投入某种产品的宣传费,需了解年宣传费
(单位:千元)对年销售量
(单位:
)的影响.对近8年的年宣传费
和年销售量
(
)数据作了初步处理,得到下面的散点图及一些统计量的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/98c2924b-7343-4ea2-879c-73df02a7f919.png?resizew=234)
表中
,
.
(1)根据散点图判断,
与
哪一个适宜作为年销售量
关于年宣传费
的回归方程类型?(给出判断即可,不必说明理由)
(2)根据(1)的判断结果及表中数据,建立
关于
的回归方程,并预计当宣传费为4千元时的年销售量;
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/d0430a3068745248a835f90e75e9868e.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/36a1b09c653185842513e24ebba60bb3.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/a5647dd8cbca280cadecb7c6eb658547.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/98c2924b-7343-4ea2-879c-73df02a7f919.png?resizew=234)
![]() | ![]() | ![]() | ![]() | |||
46.6 | 563 | 6.8 | 289.8 | 1.6 | 1469 | 108.8 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87d958bc7bbe51572fea5a9a7edeaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f42d0a9c924ba4f57de053f5a3c25c.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/26a34dd2aaeb2144ea4d31339894b62e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)根据(1)的判断结果及表中数据,建立
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64adb3bfbb0b297f050ac41df65f96b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f464a512df11942081ae3e6d8d33c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b331ccb58f3e3c4f6a669a66793b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0430a3068745248a835f90e75e9868e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2fe80079871955e17cce99f5277e14.png)
更新时间:2021-09-04 16:00:36
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解答题-应用题
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【推荐1】某种产品的广告费用支出
(万元)与销售额
(万元)之间有如下的对应数据:
(1)求回归直线方程;
(2)据此估计广告费用为12万元时的销售额约为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | 2 | 4 | 5 | 6 | 8 |
![]() | 30 | 40 | 60 | 50 | 70 |
(2)据此估计广告费用为12万元时的销售额约为多少?
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解题方法
【推荐2】某新能源汽车公司从2018年到2022年汽车年销售量
(单位:万辆)的散点图如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/4086582c-4713-4826-a263-73158d74f1c2.png?resizew=266)
记年份代码为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e1ba33c5765ebb03b29545e3151ae7.png)
(1)根据散点图判断,模型①
与模型②
,哪一个更适宜作为年销售量
关于年份代码
的回归方程?(给出判断即可,不必说明理由)
(2)根据(1)的判断结果,建立
关于
的回归方程;
(3)预测2023年该公司新能源汽车销售量.
参考数据:
参考公式:回归方程
中斜率和截距的最小二乘估计公式分别为:
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/4086582c-4713-4826-a263-73158d74f1c2.png?resizew=266)
记年份代码为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e1ba33c5765ebb03b29545e3151ae7.png)
(1)根据散点图判断,模型①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5b75998316104f379d131d55957ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)根据(1)的判断结果,建立
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)预测2023年该公司新能源汽车销售量.
参考数据:
34 | 55 | 979 | 657 | 2805 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10cb9fd6d5c388cd9d28556d9e9dd8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12bf97eb9bdf1fe6a80184f7c13ceaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
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解答题-应用题
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【推荐1】调查某公司的五名推销员,其工作年限与年推销金额如下表:
(1)在图中画出年推销金额关于工作年限的散点图,并从散点图中发现工作年限与年推销金额之间关系的一般规律;
![](https://img.xkw.com/dksih/QBM/2020/1/20/2381294808023040/2382097201446912/STEM/834eef77b7cc458bb6f546df465ca400.png?resizew=133)
(2)利用最小二乘法求年推销金额关于工作年限的回归直线方程;
(3)利用(2)中的回归方程,预测工作年限为10年的推销员的年推销金额.
附:
,
=
-![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
.
推销员 | A | B | C | D | E |
工作年限x(年) | 2 | 3 | 5 | 7 | 8 |
年推销金额y(万元) | 3 | 3.5 | 4 | 6.5 | 8 |
(1)在图中画出年推销金额关于工作年限的散点图,并从散点图中发现工作年限与年推销金额之间关系的一般规律;
![](https://img.xkw.com/dksih/QBM/2020/1/20/2381294808023040/2382097201446912/STEM/834eef77b7cc458bb6f546df465ca400.png?resizew=133)
(2)利用最小二乘法求年推销金额关于工作年限的回归直线方程;
(3)利用(2)中的回归方程,预测工作年限为10年的推销员的年推销金额.
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b081b1c0d6f222d1cf57cdae2f2e4cbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0032ca31e3cba58f973c6e75b907fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923d80da4a6cb5f102be334006d875a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
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解答题-作图题
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【推荐2】某种产品的广告费用支出
与销售额
之间有如下的对应数据:
![](https://img.xkw.com/dksih/QBM/2018/7/9/1984943373549568/1986282770006016/STEM/91d3f5a8-d5cf-427d-978a-d291fffb85a2.png?resizew=259)
(1)画出散点图,并说明销售额
与广告费用支出
之间是正相关还是负相关?
(2)请根据上表提供的数据,求回归直线方程
;
(3)据此估计广告费用为10时,销售收入
的值.
(参考公式:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2018/7/9/1984943373549568/1986282770006016/STEM/91d3f5a8-d5cf-427d-978a-d291fffb85a2.png?resizew=259)
(1)画出散点图,并说明销售额
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)请根据上表提供的数据,求回归直线方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708973e41ee9739f6fc8cd64c8006e4.png)
(3)据此估计广告费用为10时,销售收入
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5523317861c1be001aa0f863885ee98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70efaa0159e40903293b884252b32507.png)
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【推荐3】对某地区儿童的身高与体重的一组数据,我们用两种模型①
,②
拟合,得到回归方程分别为
,
,作残差分析,如表:
(1)求表中空格内的值;
(2)根据残差比较模型①,②的拟合效果,决定选择哪个模型;
(3)残差大于
的样本点被认为是异常数据,应剔除,剔除后对(2)所选择的模型重新建立回归方程.
(结果保留到小数点后两位)
附:对于一组数据
,其回归直线
的斜率和截距的最小二乘法估计分别为
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581a6a69f1039aa12764eea5bf7ef405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c488233c2213771cf239dfa03b5cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ab992cdb41d90bbdb6cedb70b3c6cc.png)
身高 | 60 | 70 | 80 | 90 | 100 | 110 |
体重 | 6 | 8 | 10 | 14 | 15 | 18 |
0.41 | 0.01 | 1.21 | -0.19 | 0.41 | ||
-0.36 | 0.07 | 0.12 | 1.69 | -0.34 | -1.12 |
(2)根据残差比较模型①,②的拟合效果,决定选择哪个模型;
(3)残差大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1b1bd0f94ae786c99ded377c0e79a6.png)
(结果保留到小数点后两位)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd833fbade2ad9520da59a3a51d84f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.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