Participants are selected by asking for volunteers, for example, placing an advertisement on college noticeboard. Can access a variety of particiapants if advertisement is in the newspaper, making the sample more representative.
Advantages:
- Relatively easy because the participants come to you and are committed e.g. likely to turn up or repeat testing.
Disadvantages:
- Non-representative as the kinds of people who respond to requests are likely to be similar e.g. better educated or have free time
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