random sampling
What random sampling means in Biology A-Level, as defined for AQA, OCR.
Definitions of random sampling
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Reference: OCR
Uses coordinates generated independently of the investigator, for example random numbers to position quadrats, so personal choice does not bias placement.
Small random samples are taken because drying kills the tissue, and calculating a mean from these ensures a reliable estimate when scaling up.
Laying two tapes at right angles as axes and generating coordinates with random numbers, which removes bias.
Topics that use random sampling
- Energy and ecosystems (A-level only) (AQA A-Level)
- Populations in ecosystems (A-level only) (AQA A-Level)
- Biodiversity (OCR A-Level)
Related terms
- species richness
- abiotic components
- abiotic factors
- Aesthetic reasons for maintaining biodiversity
- belt transect
- biological molecules
- biomass
- calorimetry
Using random sampling in the exam
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