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解题方法
1 . 某公司对某产品作市场调查,获得了该产品的定价
(单位:万元/吨)和一天的销量
吨)的一组数据,根据这组数据制作了如下统计表和散点图.
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772217148334080/2772747782963200/STEM/eabb07c9-761b-469e-a02c-615dfe063e49.png?resizew=201)
表中
.
(Ⅰ)根据散点图判断,
与
哪一个更适合作为
关于
的经验回归方程;(给出判断即可,不必说明理由)
(Ⅱ)根据(Ⅰ)的判断结果,建立
关于
的经验回归方程;
(Ⅲ)若生产1吨该产品的成本为0.25万元,依据(Ⅱ)的经验回归方程,预计每吨定价多少时,该产品一天的销售利润最大?最大利润是多少?
(经验回归方程
中,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772217148334080/2772747782963200/STEM/eabb07c9-761b-469e-a02c-615dfe063e49.png?resizew=201)
0.33 | 10 | 3 | 0.164 | 100 | 68 | 350 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea905439d2e55ab4dcaa355eca72cbf1.png)
(Ⅰ)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33199703c45b7cb9c3ac51b2eb1eedc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(Ⅱ)根据(Ⅰ)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)
(Ⅲ)若生产1吨该产品的成本为0.25万元,依据(Ⅱ)的经验回归方程,预计每吨定价多少时,该产品一天的销售利润最大?最大利润是多少?
(经验回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dda5e0b7c97f509033b5910bf2ebe11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1563296b0804d4255b078bc223a1b7f0.png)
您最近一年使用:0次
2021-07-26更新
|
959次组卷
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4卷引用:辽宁省葫芦岛市2021-2022学年高二下学期期末数学试题
辽宁省葫芦岛市2021-2022学年高二下学期期末数学试题北京市通州区2020-2021学年高二下学期期末数学试题山东省青岛市青岛大学附属中学2021-2022学年高二下学期期中数学试题(已下线)模块四 专题2 期末重组综合练(辽宁)(高二人教B)
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2 . 某电视厂家准备在五一举行促销活动,现在根据近七年的广告费与销售量的数据确定此次广告费支出.广告费支出
(万元)和销售量
(万台)的数据如下:
(1)若用线性回归模型拟合
与
的关系,求出
关于
的线性回归方程(其中
;参考方程:回归直线
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2d48bbd01f2bf94a469bd29fb2c152.png)
(2)若用模型
拟合
与
的关系,可得回归方程
,经计算线性回归模型和该模型的
分别约为0.75和0.88,请用
说明选择哪个回归模型更好;
(3)已知利润
与
,
的关系为
.根据(2)的结果回答:当广告费
时,销售量及利润的预报值是多少?(精确到
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
年份 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 |
广告费支出 | 1 | 2 | 4 | 6 | 11 | 13 | 19 |
销售量 | 1.9 | 3.2 | 4.0 | 4.4 | 5.2 | 5.3 | 5.4 |
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f8ec5fd4271341d105d5928c78bf88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28971de49e791d84eba87baa591fd261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2d48bbd01f2bf94a469bd29fb2c152.png)
(2)若用模型
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99a4d5fe26d3bc2a1eae0b8e9477288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
(3)已知利润
![](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/66cc8763d08ef100567fd7316dba556b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d21726b82e52bbd091c3d3279ba584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8824e5d2981053b0473f658ba9001a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368763128d1ad0ffad5d859fef834d0a.png)
您最近一年使用:0次
2022-12-03更新
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417次组卷
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3卷引用:辽宁省丹东市凤城一中2020-2021学年高二下学期4月月考数学试题
辽宁省丹东市凤城一中2020-2021学年高二下学期4月月考数学试题【全国百强校】山西省平遥中学2018-2019学年高二下学期期中考试数学(文)试题(已下线)第4章 概率与统计-【高分突破系列】2022-2023学年高二数学同步知识梳理+常考题型(人教B版2019选择性必修第二册)