AQA GCSE Mathematics · 8300
Specification S1 · Paper 1, Paper 2, Paper 3
Revise: Population InferenceAn incomplete sampling frame may omit relevant members of the population.
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GCSE Mathematics · key term
A list or other record of the members of a population from which a sample can be selected.
Used by AQA, Edexcel and OCR
Specification S1 · Paper 1, Paper 2, Paper 3
Revise: Population InferenceAn incomplete sampling frame may omit relevant members of the population.
Specification S1 · Paper 1, Paper 2, Paper 3
Revise: Populations and SamplesA sampling frame should cover the intended population. For a simple random sample, assign a different number to every member and use randomly generated numbers to choose the sample. This reduces deliberate selection bias because every member has an equal chance of selection.
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Specification 12.01a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A list of all members of the population from which a sample can be selected.
Revise: Populations and SamplesBias may also come from an incomplete sampling frame or from non-response if those who do not answer differ systematically from those who do. Taking more observations from the same biased source produces a more precise description of that source, not necessarily a better estimate of the intended population.