Final answer:
Descriptive, correlational, and experimental are types of psychological research.
Step-by-step explanation:
The types of psychological research out of the given options are:
- Descriptive - Descriptive research involves observing and describing behavior without manipulating variables. It focuses on gathering information and describing the characteristics of a specific population.
- Correlational - Correlational research examines the relationship between two or more variables. It helps identify patterns or associations but cannot establish causation.
- Experimental - Experimental research involves manipulating an independent variable and observing the effects on a dependent variable. It allows researchers to establish causal relationships.