Introduction to Research Methods in Social Psychology
Welcome to one of the most important parts of your Psychology course! While theories like Obedience and Conformity tell us what humans do, research methods tell us how psychologists find that information out. In this chapter, we will explore how psychologists ask questions (self-reports), how they choose their participants (sampling), and how they keep everyone safe (ethics).
Note: These methods are essential for your Unit 1 Topic A practical investigation, where you will design and conduct your own questionnaire!
1. Self-Report Methods
A self-report is any method that involves asking a participant about their feelings, attitudes, or beliefs. Instead of watching what they do, you ask them to tell you.
Questionnaires
Questionnaires are sets of written questions. They can gather two types of data:
1. Quantitative Data: Numerical data (numbers). This usually comes from closed questions, where participants choose from fixed options.
Example: A ranked scale (e.g., "On a scale of 1-5, how much do you agree..."). This is great for easy objective analysis and comparing people.
2. Qualitative Data: Descriptive data (words). This comes from open questions, where participants can answer in their own words.
Example: "Describe a time you felt pressured to obey." This provides "rich" detail but is more subjective and harder to turn into statistics.
Interviews
Interviews are face-to-face (or over the phone) conversations. There are three main types you need to know:
Structured Interviews: The researcher has a fixed list of questions and does not deviate from them. It is very reliable because every participant gets the exact same experience.
Unstructured Interviews: More like a clinical conversation. There are no set questions, allowing the researcher to follow interesting topics the participant mentions.
Semi-structured Interviews: A mix of both. There are some set questions to ensure consistency, but the researcher can ask follow-up questions to dig deeper.
Researcher Effects
We must be careful of researcher effects. This is when the person conducting the research accidentally influences the participant's answers. For example, if an interviewer looks disappointed when you say you would disobey an authority figure, you might change your answer to please them!
Quick Review: Questionnaires are great for reaching many people quickly, while interviews allow for deeper detail but take more time. Both rely on the participant being honest!
2. Sampling Techniques
Psychologists can’t study every person on Earth! Instead, they pick a sample (a small group) to represent the target population (the group they are interested in). If the sample represents the population well, the results have high generalisability.
Random Sampling: Every person in the target population has an equal chance of being picked (e.g., pulling names out of a hat).
Strength: It is usually unbiased.
Weakness: It can be very time-consuming to get a list of everyone in a large population.
Stratified Sampling: The researcher identifies the different sub-groups (strata) in a population (e.g., age, gender) and picks participants in the exact same proportions.
Strength: It is highly representative of the population.
Weakness: It is very complex and difficult to organise.
Volunteer Sampling: Participants choose to take part, often by responding to an advert or poster.
Strength: It is easy and participants are usually very motivated.
Weakness: "Volunteer bias"—the type of person who volunteers might be different from the general public (e.g., more helpful or more interested in psychology).
Opportunity Sampling: Using whoever is available at the time (e.g., asking people in a shopping mall).
Strength: Quick, easy, and cheap.
Weakness: Often unrepresentative, as you only get people who happen to be in that specific place at that specific time.
3. The British Psychological Society (BPS) Ethics
In Psychology, we must protect our participants. The BPS Code of Ethics and Conduct (2009) provides the rules all UK-based psychologists must follow. A key part of this is risk management—ensuring the benefits of the research outweigh any potential risks to the participants.
Key Ethical Principles:
Informed Consent: Participants should know what the study is about before agreeing to join. (Common mistake: Only telling them half the truth is technically a lack of informed consent!).
Avoidance of Deception: Researchers should not lie to participants unless it is absolutely necessary for the study (and even then, they must be told the truth as soon as possible).
Right to Withdraw: Participants must be told they can leave the study at any time, and they can ask for their data to be deleted.
Protection from Harm: Participants should not experience more physical or psychological stress than they would in their normal everyday lives.
Confidentiality: Personal details (names, addresses) must be kept private.
Key Takeaway: Ethics isn't just about "being nice"—it's about the credibility of the whole subject. If people don't trust psychologists, they won't take part in research!
4. Evaluating Research: The Psychologist's Toolkit
When you are asked to "evaluate" a study or a method in your exam, you should use these core concepts:
Reliability: Is the method consistent? If you did the questionnaire again with the same people, would you get the same results? Structured interviews are high in reliability because they are standardised.
Validity: Does the research measure what it claims to measure? (e.g., Does a questionnaire about obedience actually measure obedience, or just what people say they would do?).
Ecological Validity: Can the results be applied to real-life settings?
Objectivity: Keeping the research "fact-based" and free from the researcher's personal opinions. Closed questions are more objective.
Subjectivity: When findings are based on personal interpretation. Thematic analysis of qualitative data can be quite subjective.
Summary Checklist
Before moving on to the next chapter, make sure you can:
1. Define quantitative and qualitative data.
2. Explain the difference between structured and unstructured interviews.
3. List the four sampling methods and one strength of each.
4. State at least three BPS ethical guidelines.
5. Understand that your Topic A practical investigation requires you to use these self-report and sampling techniques!