Sample

Definition

A subset of a population from which data are collected.

Used by Edexcel

Specification 1c.01, 1c.03, 1c.04, 1c.05, 1c.06, 2c.05, 2g.01, 2h.01, 2h.03, 3p.06 · Paper 1, Paper 2

A smaller group selected from a population to provide data about that population.
If we cannot include the whole population, we need a sample from each group. Randomly selecting students and teachers from their respective school lists helps reduce the bias that could arise from selecting only friends or colleagues with similar music habits.
Revise: Initial planning
A subset of a population selected for data collection.
Revise: Population and sample frames

1
A larger sample does not automatically remove bias caused by the way people are selected.
2
A random starting point does not make systematic sampling a simple random sample: later selections are fixed by the interval.
3
Check that the numbers selected from all strata add up to the required sample size.

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8 more notes

Revise: Appropriate sampling techniques
A group of members selected from a population to investigate.
Revise: Simple random sampling
A subset of a population selected for a statistical investigation.
Revise: Stratified sampling
A subset of a population selected for study.
Revise: Comparing samples and populations
A group of people or items selected from a population.
Revise: Distribution of sample means
A selection of members of a population from which data are collected.
Revise: Estimating population characteristics
A selection of members of a population used to collect information about that population.
Revise: Sample size and reliability
A selection of members of a population used to investigate that population.
Revise: Experimental and theoretical probability trends