Stratified sampling
Selecting a smaller sample that is fully representative of the wider population
A very small sample group when the numbers would be so small that they are not statistically valid
Quota sampling
Selecting a smaller sample that is fully representative of the wider population
Can sometimes reinforce existing opinions
Selecting a sample in a hard to reach community where you don’t have existing contacts
Purposive/snowball sampling
Finding out who has information when you don’t already know
Getting well-informed responses from people with expertise
Accurate representation of the whole population
Can sometimes reinforce existing opinions
Cluster sampling
Selecting a manageable sample from a very large population
Accurate representation of the whole population
Fig. 6