统计推断

1. 统计推断：点估计，假设检验分析
2. 假设检验分析分为：参数估计和非参数估计
3. 假设检验量，假设其为真，
4. 弃真错误与取为错误
5. 显著性检验，控制错误发生的概率，p{去真，取伪}<alpha

 

 

 

 

 以下为matlab代码

 

%%
% 糖果包装机的样本为[0.49,0.506,0.518,0.524,0.498,0.511,0.520,0.515]
% 标准为0.5 ，标准差差为0.015
% 求其工作状态是否正常
%显著性水平：alhp=0.05

clear
clc
close all
package_weight=[0.49,0.506,0.518,0.524,0.498,0.511,0.520,0.515];
x_bar=sum(package_weight)/length(package_weight);

y=(x_bar-0.5)*(9^0.5)/0.015 %服从标准正泰分布

z=norminv(1-0.025,0,1)
%求0.05的上alpha分位点
p=y<=z %输出为false

%结论包装机不正常