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GCSE Biology · key term
A quantity or factor that can change or be measured in an investigation.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A factor that can change in an investigation.
Revise: Planning ExperimentsIn a simple comparative experiment, state the independent variable to change, the dependent variable to measure and the important control variables to keep constant. Controlling other factors improves validity because it reduces alternative explanations for any change observed.
Write a method as numbered, chronological instructions rather than as a list of apparatus or variables.
State exactly how the independent variable will be changed and how the dependent variable will be measured, including units where appropriate.
When describing a correlation, name both variables and state the direction: for example, “as X increases, Y tends to increase”. Do not simply write “they are correlated”.
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A characteristic or quantity that can change and can be measured, counted or grouped.