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Research Methods in Psychology

Foundation of Psychological Investigation

The Backbone of Psychology

Research methods form the backbone of psychology, providing tools and strategies to investigate behaviour scientifically and obtain valid, reliable data. The AQA AS and A-level specification expects students to understand various research methods, the application of research techniques, data analysis, interpretation, ethical considerations, and practical research skills. Each method has strengths, weaknesses, and is suited for different research questions.

Core Research Methods

1

Experimental Methods

Manipulating an IV and measuring its effect on a DV in controlled conditions to establish cause-and-effect relationships.
2

Observational Methods

Systematically watching and recording behaviour. Can be naturalistic or controlled.
3

Self-Report Methods

Includes questionnaires, interviews, and rating scales where participants describe their internal states.
4

Correlation Studies

Measures the strength and direction of the relationship between two continuous variables.

Experimental Method Types

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LABORATORY

Conducted in highly controlled environments to minimise confounding variables.
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FIELD

Conducted in natural environments where the IV is still manipulated but conditions are less controlled.
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NATURAL

The IV varies naturally, and the experimenter observes effects. No manipulation by the researcher.
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QUASI

Participants are allocated to conditions that already exist (e.g., males vs females).

Observational Methods Assessment

✅
AdvantagesData obtained are often more natural and less affected by demand characteristics; suitable when verbal report is not possible.
❌
LimitationsObserver bias, lack of control, time-consuming, ethical issues related to consent especially in covert observation.

Correlation Studies Principle

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What does a correlation coefficient of +0.8 mean for establishing cause-and-effect?
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Correlations do not establish causation but can highlight potential relationships worth experimental investigation. Correlation does not prove causation due to potential confounding variables.

Validity and Reliability

Reliability (Consistency) + Validity (Accuracy)
Reliability refers to consistency and replicability of findings. Internal Validity is the extent to which a study measures what it claims. External Validity is the extent to which results can be generalised beyond the study setting.

Essential Ethical Safeguards

✓

Informed Consent

Participants must agree to take part after being told the purpose of the research.
✓

Protection from Harm

Both physical and psychological safety must be ensured.
✓

Vulnerable Groups

Extra protection is needed for children, mentally ill, or other vulnerable participants.

Descriptive Statistics Key Measures

Measure Central Tendency Spread
Mean Yes No
Median Yes No
Mode Yes No
Standard Deviation No Yes

Data must be carefully analysed to draw valid conclusions. Descriptive statistics include measures of central tendency and measures of spread (range, standard deviation).

Self-Report Limitations

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Handling Bias: A key limitation of self-report is Social desirability bias and lack of insight or honesty. To minimise this, researchers often use anonymous questionnaires or complex rating scales.

Practical Research Skills Summary

Students are expected to design and conduct their own research studies.

Stage Task Focus Skill
Design Define Aims Hypotheses, Variables Planning
Conduct Gathering Data Follow ethical guidelines Accuracy
Processing Organise Data Conduct calculations ICT/Maths
Evaluate Reflect on Method Identify improvements Critical Thinking
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Research Methods in Psychology Deck
Term
Purpose of Research Methods

What is the main purpose of research methods in psychology?

Answer
Explanation

To investigate behaviour scientifically and obtain valid, reliable data.

Term
Main Research Methods

Name four main research methods in psychology.

Answer
Methods

Experimental methods, observational techniques, self-report methods, and correlations.

Term
Laboratory Experiment

What defines a laboratory experiment?

Answer
Definition

It involves manipulating the IV in a controlled environment to minimize confounding variables.

Term
Natural Experiment

What is a natural experiment?

Answer
Definition

An experiment where the IV varies naturally without researcher manipulation.

Term
Participant vs Non-Participant Observation

What is the key difference between participant and non-participant observation?

Answer
Difference

Participant observation involves joining the group being studied; non-participant does not.

Term
Limitation of Self-Report Methods

What is a major limitation of self-report methods?

Answer
Limitation

Social desirability bias and potential lack of honesty or insight.

Term
Correlation Coefficient +1

What does a correlation coefficient of +1 indicate?

Answer
Meaning

A perfect positive relationship where both variables increase together.

Term
Internal Validity

What is internal validity?

Answer
Definition

The extent to which a study measures what it claims without influence from confounding variables.

Term
Ethical Consideration: Informed Consent

What ethical consideration involves ensuring participants understand the research before participating?

Answer
Ethics

Informed consent.

Term
Field Experiment Advantage

Name one advantage of field experiments over laboratory experiments.

Answer
Advantage

Higher ecological validity due to the natural setting.

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🧠 Psychology Research Methods Quiz

1. Which method involves manipulating an independent variable to observe its effect?

Experimental methods manipulate an IV to observe effects on the DV, establishing cause and effect.

2. What is a disadvantage of laboratory experiments?

Lab experiments have high control but may not reflect real-life situations.

3. Which observation type involves the researcher being part of the group being studied?

Participant observation means the researcher is involved in the group’s activities.

4. What does a correlation coefficient of -0.85 indicate?

A value near -1 shows a strong inverse relationship between variables.

5. Which ethical principle requires that participants can stop participating at any time?

Participants must have the freedom to leave the study whenever they choose.

📊 Results

  • Notes and Quiz
  • Psychology
  • AS & A Level
  • Research Methods
  • AQA