As far back as time goes, states have always felt the need to have information about their subjects or about the goods they own and produce. It was by developing mathematical tools that the scientists of the time could set up faithful representations of the populations of the States to create the statistics.
There is a whole set of data to study and not all of them study with the same tools. Understanding the different types of data makes it possible to choose the right tool.
A good understanding of statistics is to first understand the whole of a specific terminology.
“Correlation is not causal”. It is a phrase repeatedly repeated in all the books.