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Designing Research in Psychology

The Research Planning Process

What is Research Design?

Designing research in psychology involves planning how to collect data to investigate a hypothesis. Researchers choose methods based on the type of data needed, the nature of the hypothesis, and practical considerations.

Data Methods Glossary

The foundation of research rests on the type of data gathered and its utility for analysis.

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Quantitative Methods

Generate numerical data suitable for statistical analysis, ideal for testing causal relationships or measuring variables.
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Qualitative Methods

Gather non-numerical data, such as opinions, feelings, and descriptions, useful for exploring complex phenomena.

The Experimental Mechanism

Manipulate IV ➡️ Measure Effect on DV
Experiments are designed to test cause and effect by manipulating the independent variable to see its effect on the dependent variable, while controlling extraneous variables.

Experimental Designs Overview

These three designs dictate how participants are allocated across the different conditions of the independent variable.

1

Independent Groups Design

Different participants take part in each condition of the IV. For example, one group performs a task with noise; another performs it in silence.
2

Repeated Measures Design

The same participants take part in all conditions.
3

Matched Pairs Design

Pairs of participants are matched on key variables, and each member of the pair is assigned to a different condition.

Independent Groups Analysis

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StrengthsNo order effects (practice or fatigue), simpler logistics.
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WeaknessesParticipant variables (individual differences) may affect results, requiring larger samples.

Repeated Measures Analysis

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StrengthsControls for individual differences because the same people act as their own control.
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WeaknessesProne to order effects; practice or fatigue can influence performance.

Controlling Order Effects

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Counterbalancing: Used to control these effects in Repeated Measures designs. Counterbalancing is used to control these effects.

Matched Pairs Analysis

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StrengthsControls for individual differences without order effects.
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WeaknessesMatching is time-consuming and imperfect.

Laboratory Experiments

Conducted in controlled, artificial environments where variables can be tightly controlled.

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StrengthsHigh internal validity, easier control of extraneous variables.
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WeaknessesLow ecological validity; participants may behave differently in lab settings.

Field Experiments

Conducted in natural settings but with deliberate manipulation of the IV.

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StrengthsHigh ecological validity, more natural behaviour.
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WeaknessesLess control over extraneous variables; difficult to replicate.

Natural Experiments

The IV changes naturally without researcher manipulation, e.g., comparing memory before and after an earthquake.

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StrengthsAllows study of variables that cannot be ethically manipulated.
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WeaknessesLow control, cannot establish cause and effect as confidently.

Other Core Research Methods

Methods useful for specific data types, particularly qualitative exploration and deep insight.

1

Interviews

Structured, semi-structured, or unstructured. Useful for qualitative data that explore participants' thoughts and feelings.
2

Questionnaires

Can gather large amounts of data quickly and cheaply, often using standardized questions and rating scales.
3

Case Studies

In-depth study of a single individual or small group, often used for unique or rare phenomena.
4

Observation Studies

Researchers observe behaviour directly, which can be naturalistic or controlled.

Interviews and Questionnaires

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Interviews provide in-depth data, flexible.
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Questionnaires are efficient, quantifiable data.

Case Studies Analysis

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StrengthsRich qualitative data, insight into complex issues.
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WeaknessesLow generalisability, time-consuming.

Observation Reliability Check

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Interobserver reliability: The degree to which different observers consistently record the same behaviour, crucial for reliability. Researchers must use Categories of behaviour (Predefined codes or behaviour categories help standardize observations).

Strengths and Weaknesses Summary

A high-level view of method suitability based on research goals.

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Experimental FocusExperimental designs are best for determining cause and effect but may lack ecological validity.
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Qualitative FocusQualitative methods are excellent for exploring subjective experience but can be harder to analyse statistically.
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Case Studies/ObservationsObservations and case studies provide deep insight but lack generalisability.
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Surveys/QuestionnairesSurveys and questionnaires are efficient but may suffer from social desirability bias.
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Research Design in Psychology Deck
Term
Purpose of Research Design

What is the main purpose of designing research in psychology?

Answer
Purpose

To plan how to collect data to investigate a hypothesis.

Term
Types of Research Methods

What are the two main types of research methods in psychology?

Answer
Types

Quantitative and qualitative methods.

Term
Quantitative Data

What type of data do quantitative methods produce?

Answer
Data Type

Numerical data suitable for statistical analysis.

Term
Qualitative Data

What do qualitative methods gather?

Answer
Data Type

Non-numerical data like opinions, feelings, and descriptions.

Term
Experiments and Cause/Effect

How do experiments test cause and effect?

Answer
Method

By manipulating the independent variable and observing changes in the dependent variable while controlling extraneous variables.

Term
Independent Groups Design

What is an independent groups design?

Answer
Design

Different participants are assigned to each condition of the independent variable.

Term
Strength of Repeated Measures

What is a strength of repeated measures design?

Answer
Strength

It controls for individual differences since the same participants take part in all conditions.

Term
Weakness of Repeated Measures

What is a major weakness of repeated measures design?

Answer
Weakness

It is prone to order effects like practice or fatigue.

Term
Matched Pairs Design

What method involves pairing participants matched on key variables?

Answer
Method

Matched pairs design.

Term
Laboratory Experiments

Where are laboratory experiments conducted?

Answer
Location

In controlled, artificial environments.

Term
Field Experiments

What is a key advantage of field experiments?

Answer
Advantage

They have high ecological validity with more natural behavior.

Term
Natural Experiments

What distinguishes natural experiments?

Answer
Feature

The independent variable changes naturally without researcher manipulation.

Term
Qualitative Research Method

Name a qualitative research method useful for exploring participant thoughts.

Answer
Method

Interviews.

Term
Limitations of Questionnaires

What is a major limitation of questionnaires?

Answer
Limitation

They may suffer from response bias.

Term
Case Studies

What type of research provides rich data on a single individual or small group?

Answer
Type

Case studies.

Term
Interobserver Reliability

What is interobserver reliability?

Answer
Definition

The consistency between different observers recording the same behavior.

Term
Observational Studies

Why are observational studies useful?

Answer
Usefulness

They allow study of natural behavior without direct intervention.

Term
Best Method for Cause and Effect

What research method is best for establishing cause and effect?

Answer
Method

Experimental designs.

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🧠 Psychology Research Methods Quiz

1. Which of the following designs involves the same participants in every condition?

This design uses the same participants across all conditions, controlling for individual differences but raising the risk of order effects.

2. What is a strength of laboratory experiments?

Lab experiments are conducted in controlled environments, allowing tight control over variables that might affect results.

3. Which research method is best at exploring complex participant feelings and opinions?

Interviews can gather detailed qualitative information about participant thoughts and feelings.

4. What is a main weakness of matched pairs design?

Matching participants on key variables is labor-intensive and can never be perfect.

5. True/False: Natural experiments allow researchers to confidently establish cause and effect relationships.

Natural experiments lack control over the IV and extraneous variables, limiting the ability to establish causality confidently.

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