![](https://img.xkw.com/dksih/QBM/2018/2/15/1882697196240896/1884115114049536/STEM/6b35683978ee413198f1611da6bcafa9.png?resizew=90)
![](https://img.xkw.com/dksih/QBM/2018/2/15/1882697196240896/1884115114049536/STEM/7541888e401343358b54ca352285d2e9.png?resizew=92)
![](https://img.xkw.com/dksih/QBM/2018/2/15/1882697196240896/1884115114049536/STEM/18b3b784585c4ee482605291799bc8fa.png?resizew=83)
![](https://img.xkw.com/dksih/QBM/2018/2/15/1882697196240896/1884115114049536/STEM/ae95dccfe4c54029aa8bc4930f99fa54.png?resizew=83)
A.(1)(2) | B.(1)(3) | C.(2)(4) | D.(2)(3) |
【知识点】 根据散点图判断是否线性相关解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | 2 | 3 | 4 | 5 | 6 |
![]() | 1.4 | 1.8 | 2.5 | 3.2 | 3.6 |
A.![]() | B.![]() | C.![]() | D.![]() |
【知识点】 计算样本的中心点
A.相关系数![]() ![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
【知识点】 相关关系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae048beafc460d7a3175258ff59edc5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc61e649329690e679aaf0d9c35d8d07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1058258d9aea70523615c08278e7dcd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
A.增加![]() | B.减少![]() |
C.增加![]() | D.减少![]() |
【知识点】 用回归直线方程对总体进行估计解读
广告费用![]() | 4 | 2 | 3 | 5 |
销售额![]() | 49 | 26 | 39 | 54 |
根据上表可得回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
A.63.6万元 | B.65.5万元 | C.67.7万元 | D.72.0万元 |
【知识点】 用回归直线方程对总体进行估计解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
0 | 1 | 2 | 3 | 4 | |
2.2 | 4.3 | 4.8 | 6.7 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8e5847e8a0f69c5e076b0dca028c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
A.2.5 | B.3.5 | C.4.5 | D.5.5 |
【知识点】 用回归直线方程对总体进行估计解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf70ce2cf99e7e3347ecd66a220c60b.png)
零件数 | 10 | 20 | 30 | 40 | 50 |
加工时间 | 62 | 75 | 81 | 89 |
A.68 | B.68.3 | C.68.5 | D.70 |
【知识点】 根据回归方程求原数据中的值解读
![]() | 1 | 3 | 6 | 10 |
![]() | 8 | ![]() | 4 | 2 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef96f6e2a9435ff11e1cc8c4b3afc77.png)
A.变量![]() ![]() | B.![]() ![]() |
C.![]() | D.变量![]() ![]() |
【知识点】 判断正、负相关 根据回归方程求原数据中的值解读
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764823285768192/2774745333104640/STEM/1f0be72e-2e09-4a44-a04f-bca8ffe6239a.png?resizew=454)
A.![]() | B.![]() |
C.![]() | D.![]() |
【知识点】 判断正、负相关 根据散点图判断是否线性相关解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/0effa2cd-20b4-48bf-a6c1-062cda7349dc.png?resizew=208)
A.线性相关关系较强,b的值为1.25 |
B.线性相关关系较强,b的值为0.83 |
C.线性相关关系较强,b的值为-0.87 |
D.线性相关关系太弱,无研究价值 |
【知识点】 根据散点图判断是否线性相关解读
![](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/3616f92dfc0f8485f94b3e00acadb1b6.png)
广告费用x(万元) | 2 | 4 | 5 | 6 |
销售利润y(万元) | 5 | 7 | 9 | 11 |
A.![]() | B.![]() | C.直线![]() ![]() | D.直线![]() ![]() |
【知识点】 判断正、负相关
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
数学成绩![]() | 145 | 130 | 120 | 105 | 100 | 110 |
物理成绩![]() | 110 | 90 | 102 | 78 | 70 |
数据表明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
{参考公式:回归直线方程的系数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446c21b8025405469a473aa0b32f9373.png)
A.80分 | B.82分 | C.84分 | D.86分 |
①线性相关系数r的绝对值越大,两个变量的线性相关性越弱;反之,线性相关性越强;
②将一组数据中的每个数据都加上或减去同一个常数后,平均值不变
③将一组数据中的每个数据都加上或减去同一个常数后,方差不变
④在回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b28c6b1f31a6c2836248baffb3af6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b28c6b1f31a6c2836248baffb3af6f.png)
其中
A.① | B.② | C.③ | D.④ |
x/万元 | 2.7 | 2.8 | 3.1 | 3.5 | 3.9 |
y/万元 | 1.4 | 1.5 | 1.6 | 1.8 | 2.2 |
由表中数据得回归直线方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ff29d38d50605cb5bbfde8c2735f11.png)
A.若某户年可支配收入为4万元时,则年家庭消费约为2.3万元 |
B.若某户年可支配收入为4万元时,则年家庭消费约为2.1万元 |
C.若年可支配收入每增加1万元,则年家庭消费相应平均增加0.5万元 |
D.若年可支配收入每增加1万元,则年家庭消费相应平均增加0.1万元 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701554763bdbbf2689a8dae07608da38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
价格![]() | 9 | 9.5 | 10 | 10.5 | 11 |
销售量![]() | 11 | 10 | 8 | 6 | 5 |
根据公式计算得相关系数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1929702993b1732452e092f40054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4bf7f54de132a9d871932e283afbe3.png)
参考:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e93cc87f1369b2a7e36b1364690ce7.png)
A.有![]() ![]() |
B.回归直线恒过定点![]() |
C.![]() |
D.当![]() ![]() ![]() |
【知识点】 计算样本的中心点 根据回归方程进行数据估计 根据样本中心点求参数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/d1371696-7a72-46af-8c84-7aa0e5278a33.png?resizew=173)
【知识点】 解释回归直线方程的意义解读 相关系数的意义及辨析解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa088a4729226b696c536845791d4c02.png)
x | 0 | 1 | 2 | ||
y | 5 | 2 | 2 | 1 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b7a446c18810bee61f7b04067ba6cb3.png)
【知识点】 根据回归方程求原数据中的值解读
x | 2 | 3 | 4 | 5 | 6 |
y | 3 | 4 | 6 | 8 | 9 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a4c25fa7b7754fc55548e2497a9d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
温度 | 21 | 23 | 24 | 27 | 29 | 32 |
产卵数 | 6 | 11 | 20 | 27 | 57 | 77 |
经计算得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4d544300acadd297d345bff760a41d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d15a51c21563a40745fbb8bac7ff983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8afdd64506ee88949b4dee410ff4a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b980e118b50d8d4f799bfefb9a7a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c29b927094e379d01f1226339cf3a48d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbe5e299b22acff6bece97724f5a663b.png)
附:一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56720e2f2b0ddd72156da495923698da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2852ae85cfcc804b3192ea8543c88938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92abae836b8026511113ad8c3ea23028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9218b61bbc7b5304adf61be07f0a98ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | 6 | 8 | 10 | 12 |
![]() | 2 | 3 | 5 | 6 |
![](https://img.xkw.com/dksih/QBM/2019/6/28/2235423408562176/2235572000595968/STEM/53784ff6e845469e960f023bbae6fbba.png?resizew=174)
(1)请在图中画出上表数据的散点图;
(2)请根据上表提供的数据,用最小二乘法求出
![](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/929ef3bed0a4bdd22f39e036506dc481.png)
(3)试根据(2)求出的线性回归方程,预测记忆力为9的同学的判断力.
相关公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142c2a4c4e2b1a407d9db670391a8966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
【知识点】 绘制散点图 求回归直线方程解读 根据回归方程进行数据估计
地区 | 上海 | 江苏 | 浙江 | 安徽 | 福建 |
职工平均工资 | 9.8 | 6.9 | 6.4 | 6.2 | 5.6 |
城镇居民消费水平 | 6.6 | 4.6 | 4.4 | 3.9 | 3.8 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9218b61bbc7b5304adf61be07f0a98ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c213a56d8dcffc5efe15dd98483b7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
(2)若由线性回归方程得到的估计数据与所选出的检验数据的误差均不超过1万,则认为得到的线性回归方程是可靠的,试问所得的线性回归方程是否可靠?(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c6cf002710b9137f3a88500949f22c.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca923addb6cf3d97fc36fdd6648b0805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed38b537e3980c8b2e29f352f6c56b4d.png)
【知识点】 用回归直线方程对总体进行估计解读 求回归直线方程解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
年份![]() | 2015 | 2016 | 2017 | 2018 | 2019 |
足球特色学校![]() | 0.30 | 0.60 | 1.00 | 1.40 | 1.70 |
(1)根据上表数据,利用
![](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/e423a7417c8f3d28085c1a36c6063e9f.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/9c61439ee0f72015eb3e65d2051e32d9.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/3b9377dbdab50ee9ea58514f3e274bfa.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b2bdb548fcc4c3159ccf6f2124598a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
本题参考公式和数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30c8e0fc347367e84531081d8f0b66f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d4f130dcd20ce6b62fed2ca3ab29eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498f11518368358d46204423127126e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec5f29cac1f0340ecae12821bcf7e36.png)
【知识点】 用回归直线方程对总体进行估计解读 求回归直线方程解读
旅游收入占国家GDP总量比例趋势 | |||||
年份:![]() | 1 | 2 | 3 | 4 | 5 |
占比:![]() | 10.4 | 10.8 | 11.0 | 11.0 | 11.2 |
![](https://img.xkw.com/dksih/QBM/2020/2/9/2395181300662272/2395435698970624/STEM/765cc12b-d359-429c-8cd2-aa298ba0959b.png)
(1)根据以上数据,求出占比
![](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/929ef3bed0a4bdd22f39e036506dc481.png)
(2)根据(1)所求线性回归方程,预测2019年的旅游收入所占的比例.
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/758aff5ca5774bac53de1dfb61cf266b.png)
【知识点】 求回归直线方程解读 根据回归方程进行数据估计
![](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/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa0ffdf361285b7b3bca3f223bccb4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85813cac49a339bf64e06b383224751b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/fe6c6464-226f-445b-a1d2-f27c8d05d58e.png?resizew=493)
1月 24日 | 1月 25日 | 1月 26日 | 1月 27日 | 1月 28日 | 1月 29日 | 1月 30日 | 1月 31日 | 2月 1日 | 2月 2日 | 2月 3日 |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
332 | 174 | 298 | 337 | 448 | 593 | 690 | 737 | 720 | 648 | 926 |
2月 4日 | 2月 5日 | 2月 6日 | 2月 7日 | 2月 8日 | 2月 9日 | 2月 10日 | 2月 11日 | 2月 12日 | 2月 13日 | 2月 14日 | 2月 15日 | 2月 16日 |
12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
830 | 741 | 693 | 683 | 559 | 464 | 431 | 377 | 377 | 299 | 259 | 211 | 160 |
(2)中国政府为了人民的生命安全,听取专家意见,了解了病毒信息,并迅速做出一系列的隔离防护措施,但新冠状病毒在世界范围内爆发时,某些欧美国家采取放任的态度,不治疗、不隔离、不检测,甚至不公布,请你用以上数据说明采取一系列措施的必要性,不采取措施的后果.
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549cfb189d87c12abf238e314934378e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c1d58c3f5e9f69368194b0555114c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e63a80b927cc12d5a2f3ea1c68eda2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cc832c8bc3d36dd78f4b4cf72b85b1.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da55b8d9d6057a68fa128a9f5f316804.png)
【知识点】 用回归直线方程对总体进行估计解读 求回归直线方程解读