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State the different types of sampling methods
Random
Systematic
Opportunity
Stratified
Volunteer
Random sampling
Every member of the population has an equal chance of being selected
Systematic sampling
A sampling frame is selected and every ‘nth’ person is used
Stratified sampling
Sample reflects natural proportions within the population
Opportunity sampling
Selecting participants who are available and willing to take part
Volunteer sampling
Asking people to volunteer who have the characteristics that you want
What are the problems with sampling?
Representativeness
Availability of participants
Generalisability