In many research contexts, sampling simply involves asking for volunteers. Although this can be a convenient, quick and inexpensive way of sampling, the problem with basing a study on a group of volunteers is that there is no evidence that this sample is representative of the wider population that the researcher would like to make generalizations about.
Trochim W M K (2006) 'Probability Sampling' in Research options knowledge base. Retrieved from http://www.socialresearchmethods.net/kb/sampnon.php
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