User:Yanzhi Hua/Foundations of statistics

First of all this article doesn't have a beginning and I need to add a beginning to it

Statistics is the science of data. All the collected data need to be sorted out and analyzed before reaching a conclusion, which is the whole process of statistics using data to solve practical problems. But you will find that the same data can be analyzed in different ways to reach different conclusions, and different data can be analyzed in the same way to reach different conclusions. Weather forecasts, for example, vary from one forecasting agency to another. Moreover, conclusions drawn from statistical analysis are often characterized by uncertainty, because they often describe the opportunity of something happening, which can be measured by probability. As the probability of precipitation in the weather forecast is known, if the probability of precipitation is as high as 90%, it is likely to rain, and if the probability of precipitation is only 5%, you will think it will hardly rain. But the actual situation in the end whether rain, can only wait until the forecast of the day really arrived to know.

Statistics is concerned with the quantitative characteristics of a large number of repeatable phenomena. This is because in some fields, some conclusions are difficult to describe with certainty in the same way as mathematical formulas or theorems. For example, if a parent is taller, it is generally assumed that their child will be taller. But when you look at the height of a parent and their child, you find that some of the taller parents don't have taller children. Therefore, height has a certain randomness. This randomness may be related to a person's genes, living environment, acquired diet, living habits and other factors. However, in general, taller parents tend to keep their children taller, which has long been confirmed by Francis Galton (1822-1911), a famous British biologist and statistician, through experimental data in 1855. A person's height may vary by degree, it is random. But overall, the stability of average height suggests that there is a rule in randomness, and that rule is a statistical rule. So, to go a step further, statistics is also the study of finding statistical laws.