Probability samples are those for which members of the population have a known chance of completing and actually turning in a survey.It has nothing to do with probability of being selected into the sample.

Question

Quizplus · Accepted Answer

Probability samples are defined by the fact that every member of the population has a known, non-zero chance of being selected into the sample, not by their likelihood of completing the survey.

Probability Samples Are Those for Which Members of the Population