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census
measures every member of a population
strengths: accurate result
weaknesses: expensive
simple random sampling
gives everything the same chance of being selected
strengths: bias free
weaknesses: need a sampling frame/ know everything
systematic sampling
take every kth unit where k= population/sample size
strength: quick to use
weaknesses: need a sampling frame
stratified sampling
sample represents a group of a population
sample/ population x group
strengths: represents a population
weaknesses: represented in groups
quota sampling
groups filled by researcher
strength: no sampling frame
weaknesses: potential bias
opportunity sampling
quota filled by those available at the time
strengths: cheap and easy
weakness: unlikely to be representative of all