Study Notes
Methodological concepts in psychology research involve understanding the aims and hypotheses, variables, data types, sampling techniques, and ethical guidelines. These concepts are crucial for designing, conducting, and evaluating research studies effectively.
- Research Aims — A general statement describing the purpose of an investigation. Example: "To investigate whether caffeine consumption affects reaction time in adolescents."
- Hypothesis — A testable, precise prediction about the expected outcome of a study. Example: "Participants who consume caffeine will have faster reaction times than those who do not consume caffeine."
- Independent Variable (IV) — The variable that is manipulated or changed by the researcher. Example: Amount of caffeine consumed (0mg vs 100mg).
- Dependent Variable (DV) — The variable that is measured by the researcher. Example: Reaction time measured in milliseconds.
- Quantitative Data — Numerical data that can be counted or measured. Example: Reaction times (325ms), test scores (18/20).
- Qualitative Data — Descriptive data expressed in words. Example: Interview transcripts, written descriptions of behaviour.
- Opportunity Sampling — Selecting participants who are readily available and willing to take part. Example: Asking students in your school cafeteria to participate.
- Random Sampling — Every member of the population has an equal chance of being selected. Example: Putting all students' names in a hat and drawing 30 names.
- Volunteer Sampling — Participants actively volunteer to take part. Example: Posting a notice asking for volunteers and waiting for people to respond.
Exam Tips
Key Definitions to Remember
- Research Aims: A general statement describing the purpose of an investigation.
- Hypothesis: A testable, precise prediction about the expected outcome of a study.
- Independent Variable (IV): The variable that is manipulated or changed by the researcher.
- Dependent Variable (DV): The variable that is measured by the researcher.
Common Confusions
- Confusing IV and DV: Remember, IV is what changes, DV is what is measured.
- Mixing up reliability and validity: Reliability = consistency; Validity = accuracy.
Typical Exam Questions
- What is a hypothesis? A testable, precise prediction about the expected outcome of a study.
- How do you control extraneous variables? By keeping all factors constant except the independent variable being manipulated.
- What is the difference between qualitative and quantitative data? Qualitative data is descriptive and expressed in words, while quantitative data is numerical.
What Examiners Usually Test
- Understanding of key methodological concepts like aims, hypotheses, and variables.
- Ability to apply knowledge to novel research scenarios.
- Evaluation of research methods, including strengths and weaknesses of different sampling techniques.