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1. Probability samples
2. Non-probability samples
1. Probability samples: ones in which members of the population have a
known chance (probability) of being selected
Simple Random Sample
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Systematic Sampling
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Cluster Sampling
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Stratified Random Sampling
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2. Non-probability samples: instances in which the chances (probability)
of selecting members from the population are unknown .
Convenience samples: samples drawn at the convenience of the interviewer.
People tend to make the selection at familiar locations and to choose
respondents who are like themselves.
Judgment samples: samples that require a judgment or an “educated guess” on
the part of the interviewer as to who should represent the population.
Referral samples (snowball samples): samples which require respondents to
provide the names of additional respondents.
Quota samples: samples that set a specific number of certain types of
individuals to be interviewed
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