Statistical inference (statistical inference) reading notes--the 5th chapter on the nature of random samples

With the first four chapters of knowledge, the fifth chapter entered the topic of statistical research-the study of the sample. Sample can be said to be the most basic object in the study of statistics, the mathematical nature of the sample is also the most important research topic, the major task of statistics is to extract valuable knowledge from a lot of samples, just as the study of atoms and molecules is chemical. Here is the mind map of this chapter,

Statistical inference (statistical inference) reading notes--the 5th chapter on the nature of random samples