# P-value：一个注脚

P值就是当原假设为真时，所得到的样本观察结果更极端的结果出现的概率。

The P-value is the probability of obtaining a result at least as extreme as the one that was actually observed, given that the null hypothesis is true.

# 决策与风险

/*读书笔记，白话统计系列，力图用普通话讲述统计学的基本概念。这里的题目是“决策与风险”，讲的就是两类错误（type I and type II errors）。以下改编至维恩堡《数理统计初级教程》（常学将等译，太原：山西人民出版社，1986），英文名叫Statistics: An Intuitive Approach By George H. Weinberg and John Abraham Schumaker。这书几近绝迹，当回文抄公，以期重见天日。*/