This document discusses several key methods used in psychology:
1. Observation method involves watching behavior without manipulation and recording findings for interpretation. It can provide both qualitative and quantitative data.
2. Survey research method collects quantifiable data through questionnaires or interviews to test hypotheses about populations. It must use random sampling and standardized questions.
3. Experimental method manipulates an independent variable to observe its effects on a dependent variable while controlling other variables. It establishes cause-and-effect relationships but can lack ecological validity.