151713
Descrição
Mapa Mental por Eleanor Matthewman, atualizado more than 1 year ago
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Criado por Eleanor Matthewman
mais de 11 anos atrás
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Sampling Techniques
- Random sampling- where
every member of the target
population has an equal
chance of being selected
- Best technique for providing an
unbiased representative sample of the
target population
- Very time consuming and often
impossible with a large target
population
- eg pulling names out of a hat
- Best technique for providing an
unbiased representative sample of the
target population
- Opportunity sample- using anyone is the target
population who is available
- Quick and cheap
- As it only uses people who are available at this time, the sample may
not be representative
- eg everyone in café 6
- Quick and cheap
- Systematic sample- selects
pps at fixed intervals
- eg every 10th person in the
list of the target population
- fairly cheap and fast
- eliminates possibility of bias
- researchers need to
ensure that there
are no hidden bias
- eg every 10th person in the
list of the target population
- Stratified sample- a proportional sampel
- eg if 70% of the target
population were male and
30% were female, your
sample needs to be 70%
male and 30% female
- provides a very representative sample
- Time consuming and expensive
- eg if 70% of the target
population were male and
30% were female, your
sample needs to be 70%
male and 30% female
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