The probability of each member of the population to be selected in the sample is difficult to detemine or cannot be specified
Non- Probability Sampling
Non-Probability Sampling (4)
sample selection is based on the researcher’s subjective judgement or on some prespecified criteria
Judgement/ Purposive Sampling
sample selection is based on whoever is available
Accidental/ Haphazard/ Convenience Sampling
sample selection is based on a pre- specified number
Quota
useful for studying hidden population,
selection of additional respondents is based on referrals from the initial respondents
Snowball