random sampling
What random sampling means in Biology GCSE, as defined for AQA, OCR.
Definitions of random sampling
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Reference: OCR
Uses grid coordinates generated by random number tables to position quadrats, preventing investigator bias in uniform environments.
Uses two perpendicular tape measures as a coordinate grid, selecting positions via random number generators to avoid bias.
Selection that gives every member of the population an equal chance of selection and reduces bias.
Topics that use random sampling
- Health issues (AQA GCSE)
- Monitoring and maintaining the environment (OCR GCSE)
Related terms
- atmospheric gases and water availability
- axis scaling
- biodiversity preservation
- bioindicator species
- Cause and effect in disease
- Communicable and non-communicable disease interaction
- Communicable diseases
- Correlation and causation
Using random sampling in the exam
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