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Psychological Research Methodology

Research Aims

Overall Purpose

In psychological research, aims are general statements that describe the overall purpose or goal of a study. The aim sets out what the researcher intends to investigate but does not specify precise predictions. For example, an aim might be "to investigate the effects of sleep deprivation on memory." Aims provide direction for the research and guide hypothesis formulation. A key point to note is that aims are broad and exploratory rather than specific and testable.

Aims vs. Hypotheses

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How do Aims differ from Hypotheses?
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Aims are broad statements about what is to be studied, whereas hypotheses are clear, precise, and testable predictions about what the results will be.

Hypotheses Types

Hypotheses are specific, testable statements about the expected relationship between two or more variables.

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Directional (One-Tailed): Specify the expected direction of the effect. E.g., "Sleep deprivation will decrease the number of words recalled." Requires strong theoretical backing or prior evidence.
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Non-Directional (Two-Tailed): State that a relationship exists but do not predict its direction. E.g., "There will be a difference in memory performance following sleep deprivation." Used when effects are unclear or exploratory.

Core Sampling Methods

Sampling is the process of selecting a subset (Sample) from the entire group (Population) to represent it fairly. Sampling bias limits generalisability.

R

Random Sampling

Every member has an equal chance of selection (e.g., lottery). Reduces bias but can be impractical.
S

Systematic Sampling

Selection using a fixed interval (e.g., every 10th name). Easier than random but can introduce pattern bias.
St

Stratified Sampling

Population divided into proportional subgroups (strata), then random samples taken from each. Increases generalizability.
O

Opportunity Sampling

Selecting participants who are easy to access or nearby. Convenient and cost-effective but highly likely to be biased.
V

Volunteer Sampling

Participants self-select (opt-in via adverts). Leads to biased samples based on motivation.

Pilot Study Objectives

A pilot study is a small-scale trial run conducted before the main study to identify problems and refine methods.

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Clear Instructions?

Checking whether instructions and materials are clear and understandable.
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Feasibility Check

Assessing the practicality of procedures, timing, and logistics.
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Ethical Review

Identifying any unforeseen practical or ethical issues.
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Data Reliability

Testing data collection methods or questionnaires for reliability and validity.

Experimental Designs

Designs dictate how participants are allocated to different experimental conditions.

A

Repeated Measures

Each participant takes part in all conditions. Controls individual differences but risks order effects (practice/fatigue).
B

Independent Groups

Different participants in each condition. Avoids order effects but individual differences increase variability.
C

Matched Pairs

Participants across conditions are matched on relevant characteristics (age, IQ). Reduces individual differences without order effects, but is time-consuming.

Observational Recording

These designs govern how behaviour is systematically recorded during observation.

1

Behavioural Categories

Observed behaviour is divided into clear, specific, measurable, and mutually exclusive categories (e.g., 'smiling').
2

Event Sampling

Recording each time a particular behaviour (event) occurs during the observation period. Useful for infrequent behaviours.
3

Time Sampling

Observing and recording behaviour at fixed intervals (e.g., every 30 seconds). Captures patterns but may miss intervening events.

Question Types in Research

Effective questionnaire construction requires choosing appropriate question formats.

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Open Questions (Qualitative): Allow free, detailed answers in own words. Provides rich, detailed qualitative data but is much harder to analyse quantitatively.
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Closed Questions (Quantitative): Provide fixed response options (e.g., yes/no). Easier and quicker to analyse statistically but limits the depth of responses.

Variables and Measurement

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IV (Independent Variable)

The variable manipulated or changed by the researcher.
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DV (Dependent Variable)

The variable measured to see if it is affected by changes in the IV.
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Extraneous Variable

Other variables that may unintentionally affect the DV and need to be controlled.
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Operationalisation

Defining variables so they can be measured or manipulated practically.

Internal Validity Control

Techniques to minimize extraneous variables and increase the accuracy of results.

1

Randomisation

Using chance (e.g., random selection/order) to reduce systematic bias.
2

Counterbalancing

Varying the order of conditions in repeated measures designs to control for order effects.
3

Standardisation

Keeping all procedures uniform (instructions, timing, environment) for consistency.
4

Control Groups

Groups that receive no treatment, providing a baseline for comparison.

Participant & Investigator Bias

Demand Characteristics

Occur when participants guess the aims of the study and alter their behaviour accordingly, either to please the researcher (social desirability) or to disrupt the study (screw you effect). This can threaten internal validity.

Investigator Effects

Happen when researchers unintentionally influence participant behaviour or data collection due to their expectations or behaviour (e.g., non-verbal cues, tone of voice, or selective observations).

BPS Ethical Principles

The BPS Code of Ethics provides guidance on research conduct, including issues like informed consent, deception, and protection from harm.

1

Respect

Treat participants with dignity and protect their rights, including confidentiality and voluntary participation.
2

Competence

Researchers must have the appropriate skills and knowledge required for the study.
3

Responsibility

The obligation to avoid harm and ensure adherence to legal requirements.
4

Integrity

Researchers must maintain honesty and transparency in all aspects of the research process.

Role of Peer Review

Independent experts evaluate research before publication to maintain scientific standards and produce trustworthy knowledge.

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Quality & Validity

Check research quality and validity.
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Identify Flaws

Identify errors or biases.
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Ensure Ethics

Ensure ethical standards are met.

Economic Impact Tip

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Implications for the Economy: Psychological research can impact the economy by informing policies and practices that improve productivity, workplace wellbeing, education, and healthcare. For example, research into stress management can reduce workplace absenteeism and health costs, benefiting economic efficiency.

Consistency and Accuracy

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Reliability (Consistency)

Measures the consistency of research results. Methods include Test-retest and Inter-observer reliability.
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Validity (Accuracy)

Assesses whether a study measures what it claims to. Improved by controlling extraneous variables.
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Ecological Validity

Whether findings apply accurately to real-world settings.
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Temporal Validity

Whether results hold true over different periods of time.

Features of Scientific Inquiry

Science is characterized by key methodologies that ensure rigor and trustworthiness.

A

Objectivity

Eliminating personal bias.
B

Empirical Methods

Using observation and experimentation.
C

Replicability & Falsifiability

Studies can be repeated (replicability) and hypotheses can be disproved (falsifiability).
D

Theory Construction/Paradigms

Developing testable explanations (theories) within accepted scientific frameworks (paradigms).

Reporting Investigations Structure

Clear, structured reports allow replication and critical evaluation by the scientific community.

Section Purpose Content Focus
Abstract A concise summary of the study.
Introduction Background, rationale, and hypotheses.
Method Detailed procedures, participants, materials, and design.
Results Findings presented objectively, often with tables and statistics.
Discussion Interpretation of results, limitations, and implications.
Referencing Citing sources used throughout the research report.
Psychological Research Concepts
Term
Aim

What is an aim in psychological research?

Answer
Definition

A broad, general statement describing the overall purpose or goal of the study.

Term
Hypotheses

How do hypotheses differ from aims?

Answer
Definition

Hypotheses are specific, testable predictions derived from the broader aim.

Term
Directional & Non-directional Hypotheses

What are directional and non-directional hypotheses?

Answer
Definition

Directional specify the expected direction of an effect; non-directional state a difference exists but not its direction.

Term
Sampling

What is sampling?

Answer
Definition

The process of selecting participants to represent a larger population in research.

Term
Sampling Methods

Name four common sampling methods.

Answer
Examples

Random, systematic, stratified, opportunity, and volunteer sampling.

Term
Pilot Study

What is the purpose of a pilot study?

Answer
Definition

To test research procedures on a small scale to identify and fix problems before the main study.

Term
Repeated Measures Design

Describe repeated measures design.

Answer
Description

Participants take part in all experimental conditions.

Term
Matched Pairs Design

What is the main advantage of matched pairs design?

Answer
Advantage

It controls for individual differences without order effects by matching participants on key traits.

Term
Behavioural Categories

What are behavioural categories in observational design?

Answer
Definition

Clear, measurable, and mutually exclusive labels for recorded behaviours.

Term
Open & Closed Questions

Define open and closed questions in questionnaires.

Answer
Definition

Open allow free responses; closed provide fixed response options.

Term
Independent & Dependent Variables

What are independent and dependent variables?

Answer
Definition

IV is manipulated by the researcher; DV is measured as the effect.

Term
Control

Why is control important in research?

Answer
Importance

To minimise extraneous variables and increase internal validity.

Term
Demand Characteristics

What are demand characteristics?

Answer
Definition

When participants alter behaviour because they guess the study’s aim.

Term
Ethical Considerations

Name two ethical considerations in psychological research.

Answer
Examples

Informed consent and confidentiality.

Term
Reliability

What is reliability in research?

Answer
Definition

The consistency of results over time or between observers.

Term
Validity

What does validity assess?

Answer
Definition

Whether a study measures what it claims to measure.

Term
Peer Review

Define peer review.

Answer
Definition

Independent experts evaluating research quality before publication.

Term
Experimental Design

What is the role of experimental design?

Answer
Role

To determine how participants are allocated to conditions in an experiment.

Term
Extraneous Variables

What are extraneous variables?

Answer
Definition

Uncontrolled variables that might affect the dependent variable.

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🧠 Psychological Research Concepts Quiz

1. Which of the following best describes a research aim?

An aim is a broad statement about what the researcher intends to study, without specifying outcomes.

2. What type of hypothesis predicts the direction of an effect?

Directional hypotheses specify the expected increase or decrease in the dependent variable.

3. Stratified sampling ensures subgroups of the population are represented proportionally in the sample. (True or False)

Stratified sampling divides the population into strata, then samples randomly within each to mirror proportions.

4. Which sampling method is most likely to introduce bias?

Opportunity sampling selects participants based on convenience, risking unrepresentative samples.

5. What is the main problem with repeated measures design?

Since participants experience all conditions, prior exposure may influence later performance.

6. What is the best description of operationalisation?

Operationalisation makes abstract variables measurable and workable in the research.

7. Demand characteristics increase the internal validity of a study. (True or False)

Demand characteristics can bias participant behavior, reducing internal validity.

8. Which ethical principle requires protecting participants’ anonymity?

Respect includes protecting participants’ rights like confidentiality.

9. What is the purpose of peer review in psychology research?

Peer review ensures research standards and truthfulness before sharing findings publicly.

📊 Results

  • Notes and Quiz
  • Psychology
  • AS & A Level
  • Schizophrenia
  • AQA