Random - Each sample has an equal probability of being chosen – random number generator/hat., Systematic - Individuals are selected at regular intervals from the sampling frame – e.g. every 10th person in 100., Stratified - Population is first divided into subgroups (or strata) who all share a similar characteristic. Study sample is then obtained by taking equal/proportionate sample sizes from each stratum., Convenience - Participants are selected based on availability and willingness to take part., Quota - Interviewers are given a proportionally representative quota of subjects of a specified type to attempt to recruit – e.g. 20 adult men, 20 adult women, 10 teenage girls and 10 teenage boys, Snowball - Existing subjects are asked to nominate further subjects known to them, so the sample increases in size like a rolling snowball,

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