IB Psychology: Research Methods Revision

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Does a correlation prove that one thing causes another?

Research Methods is a core part of IB Psychology. Revise the key concepts and common mistakes below, then lock them in with the free games.

Key concepts

ExperimentManipulates an independent variable to measure an effect.

HypothesisA testable prediction.

VariablesIndependent, dependent and controlled variables.

SamplingSelecting a representative group from a population.

EthicsConsent, confidentiality and protection from harm.

Data analysisDescriptive and inferential statistics.

Learn Research Methods step by step

Free interactive mini-lessons: short screens, worked examples and quick checks. Pick your exam board:

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Common mistakes to avoid

Questions where students often pick the tempting wrong answer — make sure you know the right one:

Does a correlation prove that one thing causes another?✗ Yes, a correlation proves cause and effect. ✓ No — correlation shows a relationship, not causation.

Why do psychologists use larger samples?✗ To make the effect bigger. ✓ To improve reliability and how representative the findings are.

Practise Research Methods — free games

Test yourself with these quick revision games for this topic:

▶ Two Truths, One Lie ▶ Reveal Race ▶ Connections Grid ▶ Falling Words ▶ Word Web

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