the process of selecting participants to take part in a study.
Simple random sampling- each member of the population has an equal chance of being included.
Systematic sampling-involves taking every nth item from the sampling frame.
Stratified random sampling- involved dividing the population into strata ( layers or subgroups.) Random samples from each subgroup are taken in proportion to the numbers in the population.
non probability sampling
Non probability sampling
Snowball sampling- when one member of the population is chosen and put in contact with other people.
Quota sampling- finding enough people to match the number of people in the wider population from a particular group.
Purposive sampling- chosen according to a known characteristic.
Opportunistic sample- anyone who is available
Relies on the idea that the views of a small group of people will be representative of the views of everyone else.
Sampling frame- list of names from which to choose respondents.