Sociological research uses scientific techniques including experiments, surveys, and analysis of social statistics. There are four main research methods: 1) field methods like observation and interviews to understand people's natural behaviors; 2) experiments to isolate causal effects but some argue they lack validity; 3) surveys using questionnaires or interviews to gather self-reported data from samples; and 4) analysis of existing documents and official statistics to learn about populations. However, all methods have limitations and filter reality through researchers' biases, so method triangulation is important to validate findings.