Science Practice 2 covers how psychological research is designed, conducted, and evaluated. You need to distinguish between research methodologies, identify their strengths and limitations, and recognize whether a study follows ethical guidelines.
- Experimental design: A study in which the researcher manipulates an independent variable and measures its effect on a dependent variable, allowing causal conclusions.
- Correlational design: A study that measures the relationship between two variables without manipulation; cannot establish causation.
- Within-subjects design: A research design in which each participant is observed in every condition of the study, allowing direct comparison of a participant to themselves across conditions.
- Confederate: A research assistant instructed to behave in a particular way as part of an experimental design, often to create a realistic scenario for participants.
- Ethical guidelines: Standards such as informed consent, debriefing, confidentiality, and the right to withdraw that protect research participants.
Given a study description, can you identify the independent variable, dependent variable, and control group? Can you explain one ethical concern the study raises?
| Design type | Can show causation? | Key strength | Key limitation |
|---|
| Experiment | Yes | Controls for confounding variables | May lack ecological validity |
| Correlational study | No | Studies variables that cannot be manipulated | Cannot rule out third variables |
| Case study | No | Rich, detailed data on one individual | Low generalizability |
| Survey | No | Large samples, efficient data collection | Self-report bias |