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sampling - Coggle Diagram
sampling
key words
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sample
a small group of people who represent the target population, and who are used by the researchers in their investigation.
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opportunity sampling
people who are members of the target population and are available and willing to take part in research
stratified sampling
the different subgroups in the target population are identified; then people are selected randomly from these subgroups in proportion to the numbers in the target population
representative
when the sample of participants is made up of people who have the same characteristics and abilities as the target population
sampling methods
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systematic sampling
how to do it
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then select every third, or fifth, or tenth, ect, person on the list until they have a complete sample of participants
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principles of sampling
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generalisation
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if a psychologists wants to say something about the people in from the town, then the sample must be be made up of a cross-section of the different people who live there.
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bias
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most samples in psychology are bias in some way, and to some extent
it is almost impossible to select a sample for an investigation that perfectly reflects the target population especially if it is a large target population
the representativeness of the sample depends on what sampling method is used. some methods are less biased than others
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