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Planning investigations and evaluating methods

Practical, maths and assessment skills · Lesson 3 of 5

Lesson 3 of 5

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Lesson 3 of 5 · Practical, maths and assessment skills

Planning investigations and evaluating methods

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Design an investigation by stating a testable hypothesis, identifying independent, dependent and controlled variables, and specifying how variables will be measured or standardised.
Explain how to improve validity, reliability, accuracy and precision through suitable controls, repeats, calibration, randomisation, replication and adequate sample size.

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Evaluate a method by identifying limitations, sources of error, confounding variables and risks, and propose realistic improvements linked to the aim of the investigation.

Interpret whether conclusions are justified by the data, distinguishing evidence-based inference from overgeneralisation or unsupported claims.

Apply knowledge of pilot studies, control groups, blind or double-blind procedures where relevant, and the difference between correlation and causation.

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