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:
)和年利润
(单位:千元)的影响,对近8年的宣传费
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/2022/12/2/f9eaea67-23d1-4bfb-a470-c444437a743f.png?resizew=366)
表中
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf618e5cc361724ddd6c9e0f8b3027b.png)
附:对于一组数据
,其回归线
的斜率和截距的最小二乘估计分别为:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95270e049d1b41e88e64355fe132e52.png)
(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;
(3)已知这种产品的年利润
与
的关系为
,根据(2)的结果回答:当年宣传费
时,年销售量及年利润的预报值是多少?
![](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/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505f44183f26d7ac2003e4893dcde92d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/f9eaea67-23d1-4bfb-a470-c444437a743f.png?resizew=366)
![]() ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
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/bcf618e5cc361724ddd6c9e0f8b3027b.png)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a072da1ef979857365a5f8f8d20d7fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0ca3fa62e1a430e1714c5744b33771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95270e049d1b41e88e64355fe132e52.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)
(3)已知这种产品的年利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c3228962f67ce335f22dfd14748753d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ac51f03c66c8565421400cf3a3d96e.png)
更新时间:2020-04-26 19:11:21
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相似题推荐
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解题方法
【推荐1】近年来,云南省保山市龙陵县紧紧围绕打造“中国石斛之乡”的发展定位,大力发展石斛产业,该产业带动龙陵县近四分之一人口脱贫致富.2022年8月,龙陵紫皮石斛获国家地理标志运用促进工程重点项目,并被评为优秀等次.在政府的大力扶持下,龙陵紫皮石斛产量逐年增长,2017年底到2022年底龙陵县石斛产量统计如下及散点图如图.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/a79934fb-5192-4551-86ae-6a52962bb613.png?resizew=284)
(1)根据散点图判断,
与
(a,b,c,d均为常数)哪一个更适合作为龙陵县紫皮石斛产量y关于年份代码x的回归方程类型?(给出判断即可,不必说明理由)
(2)经计算得下表中数据,根据(1)中结果,求出y关于x的回归方程;
其中
.
(3)龙陵县计划到2025年底实现紫皮石斛年产量达1.5万吨,根据(2)所求得的回归方程,预测该目标是否能完成?(参考数据:
)
附:
,
.
年份 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
年份代码x | 1 | 2 | 3 | 4 | 5 | 6 |
紫皮石斛产量y(吨) | 3200 | 3400 | 3600 | 4200 | 7500 | 9000 |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/a79934fb-5192-4551-86ae-6a52962bb613.png?resizew=284)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4495340a1576f9c45de650fdaeffbdf6.png)
(2)经计算得下表中数据,根据(1)中结果,求出y关于x的回归方程;
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
3.5 | 5150 | 8.46 | 17.5 | 20950 | 3.85 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d963566fab1df041fc425c96ed1c1d4.png)
(3)龙陵县计划到2025年底实现紫皮石斛年产量达1.5万吨,根据(2)所求得的回归方程,预测该目标是否能完成?(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96f22b4889a93bf208088759f0a1b5ed.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e21a60230ad30402ae5e44d1d4d039b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f149458ffc83c8f613f84386f529f476.png)
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【推荐2】2015男篮亚锦赛决赛阶段,中国男篮以9连胜的不败战绩赢得第28届亚锦赛冠军,同时拿到亚洲唯一1张直通里约奥运会的入场券,赛后,中国男篮主力易建联荣膺本届亚锦赛
(最有价值球员),下表是易建联在这9场比赛中投篮的统计数据.
![](https://img.xkw.com/dksih/QBM/2017/3/30/1654877079814144/1654970073726976/STEM/967f82307e4149b38793cfddef229209.png?resizew=550)
![](https://img.xkw.com/dksih/QBM/2017/3/30/1654877079814144/1654970073726976/STEM/41a7d2624927422ab5e911068044d6d1.png?resizew=559)
注:(1)表中
表示出手
次命中
次;
(2)
(真实得分率)是衡量球员进攻的效率,其计算公式为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8adef5f7cc39fc8c74c6294e4cc070b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc90df07d0ebf6f4e498a73990ee3f6b.png)
(1)从上述9场比赛中随机选择一场,求易建联在该场比赛中
超过50%的概率;
(2)从上述9场比赛中随机选择一场,求易建联在该场比赛中
至少有一场超过60%的概率;
(3)用
来表示易建联某场的得分,用
来表示中国队该场的总分,画出散点图如图所示,请根据散点图判断
与
之间是否具有线性相关关系?结合实际简单说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99dee7c017d84e474d99a42c00c6ff28.png)
![](https://img.xkw.com/dksih/QBM/2017/3/30/1654877079814144/1654970073726976/STEM/967f82307e4149b38793cfddef229209.png?resizew=550)
![](https://img.xkw.com/dksih/QBM/2017/3/30/1654877079814144/1654970073726976/STEM/41a7d2624927422ab5e911068044d6d1.png?resizew=559)
注:(1)表中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1509c61e6bd58b1dea8330bf6f0c73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8adef5f7cc39fc8c74c6294e4cc070b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc90df07d0ebf6f4e498a73990ee3f6b.png)
(1)从上述9场比赛中随机选择一场,求易建联在该场比赛中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1509c61e6bd58b1dea8330bf6f0c73.png)
(2)从上述9场比赛中随机选择一场,求易建联在该场比赛中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1509c61e6bd58b1dea8330bf6f0c73.png)
(3)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2017/3/30/1654877079814144/1654970073726976/STEM/7e9b934a7d33454d85737bc2b1b8a507.png?resizew=261)
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【推荐3】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
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/editorImg/2022/12/9/3615c5f8-a8c4-439e-afae-69eb8989c049.png?resizew=275)
(Ⅰ)利用散点图判断,
和
(其中
,
为大于
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);
(Ⅱ)对数据作出如下处理:令
,
,得到相关统计量的值如下表:
根据(Ⅰ)的判断结果及表中数据,求
关于
的回归方程;
(Ⅲ)已知企业年利润
(单位:千万元)与
,
的关系为
(其中
),根据(Ⅱ)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/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4169c0824ad9e2ea49130af731d729aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/3615c5f8-a8c4-439e-afae-69eb8989c049.png?resizew=275)
(Ⅰ)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/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(Ⅱ)对数据作出如下处理:令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324f7ae538a7f525cf5bde94d107802a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756a3d190ef720302c43ed4ba84603ab.png)
![]() | ![]() | ![]() | ![]() |
30.5 | 15 | 15 | 46.5 |
根据(Ⅰ)的判断结果及表中数据,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(Ⅲ)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/7d218992d1942266d7208e476d0c4100.png)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb023c9c55a02a5abf07c66086ebaa44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180370bdded4b9e10b453931a2d0a5c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74f74cbf0703d6e9be0a896d46e66956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f4e63194f9dbde0d3aaa8c410f9479.png)
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【推荐1】对某种书籍每册的成本费
(元)与印刷册数
(千册)的数据作了初步处理,得到下面的散点图及一些统计量的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/24619627-cb40-46f7-9c3d-c9ffb76b15a1.png?resizew=220)
其中
,
.
为了预测印刷
千册时每册的成本费,建立了两个回归模型:
,
.
(1)根据散点图,你认为选择哪个模型预测更可靠?(只选出模型即可)
(2)根据所给数据和(1)中的模型选择,求
关于
的回归方程,并预测印刷
千册时每册的成本费.
附:对于一组数据
,
,…,
,其回归方程
的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://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
4.83 | 4.22 | 0.3775 | 60.17 | 0.60 | -39.38 | 4.8 |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/24619627-cb40-46f7-9c3d-c9ffb76b15a1.png?resizew=220)
其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea95386143ca81477e74de3e9012ee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f04ac2036939fd33f81043962eb588.png)
为了预测印刷
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8901c469ca9b12a490dbb827c906215b.png)
(1)根据散点图,你认为选择哪个模型预测更可靠?(只选出模型即可)
(2)根据所给数据和(1)中的模型选择,求
![](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/4b7f27ebcef70a3ebbbe8d2e53ea0896.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/6a14e40329de36fc4a1a3f8fbfafda12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0940cc781cd9cb5c05a3795acec775cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f369c6de787158be2ead89c962f77b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815e2869dc16e2ae7a7e1911e3afc8c3.png)
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【推荐2】某机构为了调查某市同时符合条件
与
(条件
:营养均衡,作息规律;条件
:经常锻炼,劳逸结合)的高中男生的体重
(单位:
)与身高
(单位:
)是否存在较好的线性关系,该机构搜集了
位满足条件的高中男生的数据,得到如下表格:
根据表中数据计算得到
关于
的线性回归方程对应的直线的斜率为
.
(1)求
关于
的线性回归方程
(
精确到整数部分);
(2)已知
,且当
时,回归方程的拟合效果较好.试结合数据
,判断(1)中的回归方程的拟合效果是否良好?
(3)该市某高中有
位男生同时符合条件
与
,将这
位男生的身高(单位:
)的数据绘制成如下的茎叶图.利用(1)中的回归方程估计这
位男生的体重未超过
的所有男生体重(单位:
)的平均数(结果精确到整数部分).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a541551402a5fadca4831fe902e95c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
身高/ | ||||||
体重/ |
![](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/20eaf39f96ace648feeff4e847ab5ea4.png)
(1)求
![](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/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0032ca31e3cba58f973c6e75b907fb1.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbbded83bb1eaa7bca5baaefbbf4bcd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d2f74a3ebf397f1a0d3a36bb5e6cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474cb129535a037de858b51faead3afe.png)
(3)该市某高中有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51ef4df80a6f3cb21e068b85952fb8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979930350878720/1982208156663808/STEM/cb105dcb974041b89206867628eb5ad6.png?resizew=124)
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解题方法
【推荐3】![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
指数是用体重公斤数除以身高米数的平方得出的数字,是国际上常用的衡量人体胖瘦程度以及是否健康的一个标准.对于高中男体育特长生而言,当
数值大于或等于20.5时,我们说体重较重,当
数值小于20.5时,我们说体重较轻,身高大于或等于170cm我们说身高较高,身高小于170cm我们说身高较矮.
(1)已知某高中共有32名男体育特长生,其身高与
指数的数据如散点图,请根据所得信息,完成下述列联表,并判断是否有
的把握认为男生的身高对
指数有影响.
![](https://img.xkw.com/dksih/QBM/2020/8/2/2519411358064640/2520642001117184/STEM/733f53ec5d0d4d6498d261c794c222f6.png?resizew=439)
(2)①从上述32名男体育特长生中随机选取8名,其身高和体重的数据如表所示:
根据最小二乘法的思想与公式求得线性回归方程为
.利用已经求得的线性回归方程,请完善下列残差表,并求
(解释变量(身高)对于预报变量(体重)变化的贡献值)(保留两位有效数字);
②通过残差分析,对于残差的最大(绝对值)的那组数据,需要确认在样本点的采集中是否有人为的错误,已知通过重新采集发现,该组数据的体重应该为
(
).小明重新根据最小二乘法的思想与公式,已算出
,请在小明所算的基础上求出男体育特长生的身高与体重的线性回归方程.
参考数据:
,
,
,
,
参考公式:
,
,
,
,
(
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2553c3cb1bda75f54adf38f2ae67fc35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2553c3cb1bda75f54adf38f2ae67fc35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2553c3cb1bda75f54adf38f2ae67fc35.png)
(1)已知某高中共有32名男体育特长生,其身高与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2553c3cb1bda75f54adf38f2ae67fc35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b399e6815afcaa24f2889e58c79c10a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2553c3cb1bda75f54adf38f2ae67fc35.png)
![](https://img.xkw.com/dksih/QBM/2020/8/2/2519411358064640/2520642001117184/STEM/733f53ec5d0d4d6498d261c794c222f6.png?resizew=439)
身高较矮 | 身高较高 | 合计 | |
体重较轻 | |||
体重较重 | |||
合计 |
(2)①从上述32名男体育特长生中随机选取8名,其身高和体重的数据如表所示:
编号 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
身高(![]() ![]() | 166 | 167 | 160 | 173 | 178 | 169 | 158 | 173 |
体重(![]() ![]() | 57 | 58 | 53 | 61 | 66 | 57 | 50 | 66 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa15fc44e4a155dad7eee102c5206a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
编号 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
体重(kg)![]() | 57 | 58 | 53 | 61 | 66 | 57 | 50 | 66 |
残差![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4066a75edc8587024d3d2f21274220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f7c4a8558eff6427d22b6c0c855721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9af9c86fed302138947805bf7dd3c3.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe3d2a4ec98747aa42f00baaec39823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6839e1e8c3ff5c014fab3c176ddb1865.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782c107e589dbf2cd7219e0d19b9fabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90279fa7751bcbf08ae7b044cd885ba3.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993ebf9d252567fc4868571aa543b3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4868f47c18773912667d082b2e413b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05dec7e25b351edd22bee03ae667fdfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.10 | 0.05 | 0.01 | 0.005 |
![]() | 2.706 | 3.811 | 6.635 | 7.879 |
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适中
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解题方法
【推荐1】能源和环境问题是目前全球性急需解决的问题,虽然近百年人类文明有了前所未有的发展,但对于能源的使用和环境的破坏也造成了严重的后果,发展新能源是时代的要求,是未来生存的要求.新能源汽车不仅对环境保护具有重大的意义而且还能够减少对不可再生资源的开发,是全球汽车发展的重要方向.“保护环境,人人有责”,在政府和有关企业的努力下,某市近几年新能源汽车的购买情况如下表所示:
(1)根据上表数据,计算
与
的相关系数
,并说明
与
的线性相关性强弱(若
,则认为
与
线性相关性很强;若
,则认为
与
线性相关性一般;若
,则认为
与
线性相关性较弱);
(2)求
关于
的线性回归方程,并预测该市2024年新能源汽车购买辆数(精确到个位).
参考公式:
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
参考数值:
.
年份x | 2019 | 2020 | 2021 | 2022 | 2023 |
汽车购买y(万辆) | 0.30 | 0.60 | 1.00 | 1.40 | 1.70 |
![](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/11bc05f41215f9894e11d1df0465751a.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/fbb1c91620f163dfe969ec894b055b9f.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/17366d0d11336e19e102713aeb797e54.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/c14ee7b7c17a51b073f37f1eee76c8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da279767d83574d37510156b3efdf1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce5c5e308ed1fc05e04cec8070218ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
参考数值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d4f130dcd20ce6b62fed2ca3ab29eb.png)
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名校
解题方法
【推荐2】《中华人民共和国道路交通安全法》第
条的相关规定:机动车行经人行横道时,应当减速慢行;遇行人正在通过人行横道,应当停车让行,俗称“礼让斑马线”,《中华人民共和国道路交通安全法》第
条规定:对不礼让行人的驾驶员处以扣
分,罚款
元的处罚.
(1)交警从这
个月内通过该路口的驾驶员中随机抽查了
人,调查驾驶员不“礼让斑马线”行为与驾龄的关系,得到如下列联表:能否据此判断有
的把握认为“礼让斑马线”行为与驾龄有关?
(2)下图是某市一主干路口监控设备所抓拍的5个月内驾驶员不“礼让斑马线”行为的折线图:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/f347c0e5-a3bf-4893-8f98-a6cf56efa60b.png?resizew=268)
请结合图形和所给数据求违章驾驶员人数
与月份
之间的回归直线方程
,并预测该路口7月份的不“礼让斑马线”违章驾驶员人数.
附注:参考数据:
,
.
参考公式:
,
,
(其中
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab424495590c9dfe320f4d85c48177f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
(1)交警从这
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d40443dee7b58456efda6e09d650a.png)
不礼让斑马线 | 礼让斑马线 | 合计 | |
驾龄不超过![]() | ![]() | ![]() | ![]() |
驾龄![]() | ![]() | ![]() | ![]() |
合计 | ![]() | ![]() | ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/f347c0e5-a3bf-4893-8f98-a6cf56efa60b.png?resizew=268)
请结合图形和所给数据求违章驾驶员人数
![](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/1db6103cb0f1d2bd6b19235d53ee7e98.png)
附注:参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f772a11e2c399f5d0159532f134889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d8630e3c9a3c3a76a7fefa8742199f.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dacafb8256a70ee7e2fbdb28cf933f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
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