The document discusses different methods of classifying, presenting, and collecting statistical data. It describes ways to categorize data based on nature, source, arrangement, and measurement. Various tools for presenting statistical data are also outlined, including tables, charts, graphs, and diagrams. Sources of data are distinguished as primary, secondary, or tertiary. Sampling methods like simple random, systematic, and stratified are introduced as a more efficient way to estimate characteristics of a whole population compared to a complete census.