Which group represents a convenience sample?
1. The students seen in the University Health Clinic on one afternoon in May.
2. IV drug users recruited by the original study subjects who are IV drug users.
3. Middle-class Caucasian females chosen as representatives of the accessible population.
4. Twenty male subjects and twenty female subjects chosen for a study on gender differences.
1
Rationale 1: Convenience sampling involves choosing readily available people for a study, such as those who happen to be treated in the clinic on that afternoon.
Rationale 2: This is an example of snowball sampling.
Rationale 3: This is an example of purposive or judgmental sampling.
Rationale 4: This is an example of quota sampling, in this case an even number of males and females.
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