Statistics needs mathematical foundation, probability theory and mathematical statistics. Statistics is a branch of applied mathematics, which mainly uses probability theory to establish mathematical models, collect data from observation systems, make quantitative analysis and summary, and then infer and predict, providing basis and reference for relevant decisions.

It is widely used in various disciplines, from physics, social sciences to humanities, and even in industrial and commercial and government information decision-making. Statistics are mainly divided into descriptive statistics and inferential statistics.

Given a set of data, statistics can summarize and describe these data. This usage is called descriptive statistics. In addition, the observer establishes a mathematical model in the form of data to explain its randomness and uncertainty, thus inferring the steps in the research.

Before studying, we should understand the idea and purpose of statistics. Every basic knowledge of statistics has its corresponding mathematical foundation, so you must understand mathematics. Most of the basic knowledge of statistics comes from the actual demand, and we can understand the foundation and methods by combining with the reality. Thinking while doing things can get twice the result with half the effort. Do more basic questions and do some targeted exercises that you don't understand.