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The possibility of doing statistical inference highly depends on how representative the sample is of the population under study.

Sampling theory does not apply to all sample collection methods (i.e. interview, postal, questionnaire, observation...)

Convenience sampling

Is a probabilistic technique ensuring every individual of the population has the same probability of being in the sample

Is a probabilistic method that ensures that certain quotas of characteristics of the population are kept

None are true

Requires that we have information about the sample frame

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