题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160640-13931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160641-33238.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160641-33238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160640-13931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160643-72913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160643-28089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160643-26615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160643-25790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160643-72913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160644-53000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160644-58970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160644-37218.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160644-76516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160644-40393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160641-56989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160645-87020.png)
答案
解析
试题分析:由题意知
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160645-15990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160645-89438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160646-37899.png)
回归直线的方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160646-81322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160646-99612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160646-34467.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160647-54312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160647-69293.png)
核心考点
试题【某研究机构对高三学生的记忆力和判断力进行统计分析,得下表数据:根据上表提供的数据,用最小二乘法求出关于的线性回归方程中的的值为,则记忆力为的同学的判断力约为(附】;主要考察你对回归直线最小二乘法等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160632-85448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160632-79372.png)
![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() |
根据上表提供的数据,用最小二乘法求出
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160632-79372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160632-85448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160634-96970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160634-17204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160635-16733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160635-27531.png)
(附:线性回归方程
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160634-96970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160635-56561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160635-31510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160636-76691.png)
A.95% | B.99% | C.99.5% | D.99.9% |
| 患心脏病 | 不患心脏病 | 合计 |
男 | 20 | 5 | 25 |
女 | 10 | 15 | 25 |
合计 | 30 | 20 | 50 |
参考临界值表:
![]() | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
K | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160623-80027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160618-44280.png)
①劳动生产率为1千元时,工资为130元;②劳动生产率提高1千元,则工资提高80元;③劳动生产率提高1千元,则工资提高130元;④当月工资为210元时,劳动生产率为2千元.
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026160609-61471.png)
A.直线l过点![]() |
B.x和y的相关系数为直线l的斜率 |
C.x和y的相关系数在0到1之间 |
D.当n为偶数时,分布在l两侧的样本点的个数一定相同 |
x | 1 | 1 | 2 | 4 |
y | 1 | 4 | 5 | 6 |
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