What are the methods of psychological investigation?

What are the methods of psychological investigation? (a) Case study method (b) Observation method (c) Experimental method (d) Survey method (e) All above ✅ Correct Option: (e) All above Explanation: Psychological investigation employs multiple methods: Case Study examines individuals in depth, Observation records behavior systematically, Experimental manipulates variables to determine cause-effect relationships, Survey collects large-scale data through questionnaires/interviews. Using multiple methods ensures valid, reliable, and generalizable results. PPSC often tests knowledge of research methods in psychology. 10 PPSC-Relevant Facts: 1. Case study = in-depth individual analysis 2. Observation = real-time behavior 3. Experimental = cause-effect 4. Survey = large-scale data 5. Methods ensure reliability 6. Methods ensure validity 7. Basis for applied psychology 8. Supports teaching and research 9. Helps analyze mental processes 10. High-frequency MCQ