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Slide 1

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Opportunity Sampling
Sample collected by asking individuals who
are available at the time and fit the criteria
you are looking for.
Ad Dis
·Quick ·Non-representative sample
likely ­ makes hard to
·Cheap generalise findings to wider
population (low External
Ecological Validity)
·May try to be seen as socially
acceptable/demand
characteristics…read more

Slide 2

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Random Sampling
A sample which every member of that population has
an equal chance of being picked ­ requires complete
list of individuals in popuation/organisation/instituation.
Ad Dis
·More likely to be ·Non-representative sample
possible - makes hard to
representative than generalise findings to wider
Opportunity sampling population (low External
Ecological Validity)
·May try to be seen as
socially acceptable/demand
characteristics…read more

Slide 3

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Stratified Sampling
Involves putting the population in to
categories and choosing a sample where
the individuals in categories are in
proportion as the actual sample
Ad Dis
·Most likely to be ·Expensive
representative ·Time consuming
compared to all other ·May try to be seen as
methods socially
acceptable/demand
characteristics…read more

Slide 4

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Self Selected Sampling
Also known as Volunteer sampling. Involves
individuals volunteering themselves to take part
(normally in response to ad or when asked)
Ad Dis
·Relatively cheap ·May display demand
characteristics
·Fast to collect ·Sample could be different in
participants some way due to
volunteering (may have keen
·P's more co- interest in topic or may have
operative less to do than everyone
else)
·May try to be seen as
socially acceptable/demand
characteristics…read more

Slide 5

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Systematic Sampling
A complete list of individuals is obtained and
then every nth individual is chosen.
Ad Dis
·More likely to be ·Still moderate chance
representative than of unrepresentative
Opportunity sample
·Maybe less co-
operative than Self
Selected
·May try to be seen as
socially
acceptable/demand
characteristics…read more

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