A convenience sample is when people are chosen for a research study because they are easily available or willing to participate. It may not represent the entire population accurately, but it is done for the sake of convenience. Full definition
The questionnaire relied on convenience sampling and, therefore, the results could not be generalized beyond the study sample. (aaas.org)
The majority of research exploring the association between family functioning and obesity risk has included small, convenience samples [28, 30, 31]. (ijbnpa.biomedcentral.com)
However, a majority of the studies included in the meta - analysis were conducted with convenience samples of college students or community subclinical samples: of the 20 included samples, only one was recruited from clinical populations, involving adults with a diagnosis of Generalised Anxiety Disorder (Roemer et al. 2009). (link.springer.com)