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【概率论期末抱佛脚】概念+公式(不含参数估计)
2022-06-24 12:33:00 【千里桦林】
目录
第一章
1、互不相容
2、随机事件运算律
交换律、结合律、分配律、自反律、对偶律
3、概率测度的其他性质(6条+1推论)
4、条件概率
5、全概率公式(必考)
6、贝叶斯公式
7、两个事件的独立性
8、伯努利实验
只有两个事件:
n重伯努利:
(1)某个事件发生k次:
(2)某个事件第k次才发生:
第二章
1、分布函数
对连续性和离散型都适用。
2、概率密度函数
3、数学期望
离散型:
连续型:
性质:
4、方差
DX 的原始定义:
DX 更常用的公式:
5、离散型分布和连续型分布
可能考的:二项分布、泊松分布、均匀分布、指数分布、正态分布
书本例题 P79
例题 P80
第三章
1、联合概率分布(表格)
2、联合分布函数
3、概率密度函数
(1)联合概率密度:
(2)边缘密度函数:
4、条件分布
5、X和Y相互独立
充要条件:
(1)
(2)
例题(必须掌握)
6、条件密度函数
课本例题
注意均匀分布:f(x)= 1 / 面积
积分时:y范围是 [0,√1-x² ]
最后总结处的范围写:条件分布分子的范围
7、卷积公式(挺重要的,但这次不考)
8、正态分布线性组合
9、二维数学期望
(1)数学期望的计算:
(2)性质:尤其注意相互独立的情况!
10、协方差
(1)原始定义:(知道一下)
(2)常用公式:
(3)性质:
11、相关系数
(1)公式:
(2)意义:
(3)不相关的必要条件:
12、中心极限定理
13、统计量的定义
课本例题
14、卡方分布、F分布、t分布
卡方分布:(选填可用定理)
F 分布:(一定要看清楚 n 和 m)
t 分布:
推论:
以上为考前速度整理(不一定完整)。
END
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