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Methodological Issues in Psychology Research

Research Integrity Overview

Defining Methodology

Methodological issues in psychology research concern the design, procedure, reliability, validity, bias, and ethics, all of which impact the quality and integrity of the research.

Sample and Population Reach

Representativeness vs Generalisability

Representativeness refers to the degree a sample reflects the characteristics of the target population. Random sampling and stratified sampling methods enhance representativeness.

Generalisability is the extent to which research findings can be applied to populations beyond the study sample. Studies with low ecological or population validity have limited generalisability.

Consistency of Measurement (Reliability)

Reliability refers to the consistency and stability of measurement or results.

1

Internal reliability

Consistency within the measure itself, e.g., checking if questionnaire items correlate.
2

External reliability

Replicability over time or across researchers.
3

Inter-rater reliability

The degree to which different observers agree on the same observation.
4

Test-retest reliability

Stability of results when the same test is administered at different times.
5

Split-half reliability

Correlation between two halves of a test to examine internal consistency.

Accuracy and Truthfulness (Validity)

Validity refers to the accuracy of a measure or study in capturing what it is intended to measure.

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Internal validity

Extent to which a study establishes cause-effect relationships without confounds.
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Face validity

Whether a test appears to measure what it claims (subjective judgment).
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Construct validity

The degree to which a test measures the theoretical construct it intends to measure.
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Concurrent validity

Agreement between new measures and established measures taken at the same time.
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Criterion validity

How well a measure predicts outcomes based on external criteria.
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External validity

How well findings generalize to other contexts or populations.

Demand Characteristics

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The Issue (Result) Lead to biased results and reduced internal validity.
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The Cause (Mechanism) Cues or signals in an experiment that influence participants to behave in ways expected by the researcher.

Social Desirability Bias

This bias reduces validity, especially in self-report studies, when participants prioritize favorable responses over truth.

🧑‍💼
Researcher: "How often do you engage in environmentally responsible behavior?"
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Participant: "Always! (Even though I rarely recycle)."

Minimizing Observer Influence

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Controlling Bias: When the researcher’s expectations or beliefs influence observations or interpretations (Researcher/Observer Bias), this is minimized by using blind or double-blind procedures.

*Note: The presence or behavior of the researcher altering participant behavior is known as the Hawthorne effect (Researcher/Observer Effect(s)).

BPS Code of Ethics and Conduct

Adhering to these ethical principles safeguards participants and maintains trust in psychological research.

I

Respect

Informed consent, Right to withdraw, Confidentiality: Participants’ identities and data must be protected.
II

Competence

Researchers must have appropriate skills and qualifications.
III

Responsibility

Protection of participants (avoidance of harm or distress), and Debrief.
IV

Integrity

Avoid deception unless justified, report findings honestly, and take responsibility for errors.
Methodological Issues in Psychology Research
Term
Representativeness

What does representativeness in psychology research mean?

Answer
Definition

The degree to which a sample reflects the target population’s characteristics.

Term
Generalisability

Why is generalisability important in psychological research?

Answer
Importance

It determines if findings apply to populations beyond the study sample.

Term
Sampling Methods

Name two sampling methods that improve representativeness.

Answer
Examples

Random sampling and stratified sampling.

Term
Internal Reliability

What is internal reliability?

Answer
Definition

Consistency within a measure itself, such as questionnaire item correlation.

Term
Test-Retest Reliability

Define test-retest reliability.

Answer
Definition

Stability of results when the same test is repeated over time.

Term
Construct Validity

What does construct validity assess?

Answer
Definition

How well a test measures the theoretical construct it intends to measure.

Term
Demand Characteristics

What are demand characteristics?

Answer
Definition

Cues that influence participants to behave as expected by the researcher.

Term
Social Desirability Bias

How can social desirability bias affect research?

Answer
Effect

Participants may respond to appear favorable, reducing data validity.

Term
Researcher Bias

What is researcher bias?

Answer
Definition

When researchers’ expectations influence observations or interpretations.

Term
Hawthorne Effect

What is the Hawthorne effect?

Answer
Definition

Participant behavior changes due to researcher presence or behavior.

Term
Ethical Principle

List one key ethical principle from the British Psychological Society’s Code.

Answer
Example Principles

Informed consent, confidentiality, right to withdraw, competence, responsibility, or integrity.

Term
Minimizing Researcher Bias

How can researcher bias be minimized?

Answer
Methods

Using blind or double-blind procedures.

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🧠 Methodological Issues in Psychology Research Quiz

1. Which sampling method aims to ensure every member of the population has an equal chance of selection?

Random sampling reduces bias by giving all population members an equal selection chance.

2. What type of validity assesses whether a test appears to measure what it claims on the surface?

Face validity is a subjective assessment of whether a test looks like it measures the intended variable.

3. Which bias occurs when participants alter behavior to meet researcher expectations?

Demand characteristics occur when participants pick up cues and behave as they believe the researcher expects.

4. The Hawthorne effect describes:

The Hawthorne effect happens when participants act differently knowing they are being observed.

5. Which of the following is NOT part of ethical considerations in psychology research?

Ethical research requires protection from harm, so ignoring distress is unacceptable.

📊 Results

  • Notes and Quiz
  • Psychology
  • A Level
  • Memory
  • OCR