And some sampling techniques..:
- Simple random: Each member of the population has an equal chance of being selected (like names being drawn from a hat)
- Systematic: Researchers take every 'nth' item from the sampling frame, for example every 20th name from a school register
- Stratified random: Researchers divide the population into strata (subgroups) according to characteristics such as age, gender and ethnicity. They then randomly draw a sample from each subgroup in proportion to the numbers in the population
- Snowball: Through contact with one member of a population (e.g. one member of a youth culture), the researcher is introduced to, or identifies others in the same population
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