====== 第六章：假设检验初步(Ⅱ)与t检验======

======Chapter 6: Hypothesis Testing Preliminary (II) and T-test======

=)**本章概览 (Guide)**：
  * 在前一章，我们初步了解了假设检验的基本步骤与两类错误。在本章，我们继续学习z检验的相关知识，并且区分了效力和效应，了解提高效力的途径。与z检验相比，t检验大多是在方差未知的情况下进行的，我们以样本方差代替标准差，结合对应的自由度进行假设检验。\\ In the previous chapter, we preliminary understanded the basic steps and two types of errors of hypothesis testing. In this chapter, we continue to learn about the relevant knowledge of Z-tests and distinguish between efficacy and effect, understanding ways to improve efficacy. Compared with the Z-test, T-test is mostly conducted when the variance is unknown. We use sample variance instead of standard deviation and combine it with corresponding degrees of freedom for hypothesis testing.

:!:**学习要点 (Learning Points)**：
  - 区分单尾检验与双尾检验 \\ Distinguishing between single tailed and two tailed tests
  - 掌握z检验的步骤与前提 \\ Master the steps and prerequisites of z-test
  - 学习什么是效力、怎样提高效力 \\ Learn what power is and how to improve it
  - 学会计算和评价处理效应 \\ Learn to calculate and evaluate processing effect
  - 掌握t统计量和t检验的步骤 \\ Mastering the steps of t-statistics and t-test

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**目录**
  * [[单尾检验与双尾检验|单尾检验与双尾检验 (Single tailed test and two tailed test)]]
  *[[Assumptions|Z检验的前提 (The premise of Z-test)]] 
  * [[效力（Power）|效力 (Power)]]
  * [[提高效力的途径|提高效力的途径 (Ways to improve power)]]
  * [[效应值（Effect Size）|效应值 (Effect Size)]]
  * [[t检验|t检验 (T-test)]]

**作业**
  * [[作业|2023作业 (homework of 2023)]]
  * [[2024第六章作业|2024作业 (homework of 2024)]]