Probability sampling (random sampling)
ο It is a selection process that ensures each participant the same probability of being selected.
ο Random sampling is the best method for ensuring that a sample is representative of the larger population.
ο Random sampling can be:
ο It is the selection process in which the probability that any one individual or subject selected is not equal to the probability that another individual or subject may be chosen.
ο The probability of inclusion and the degree to which the sample represents the population are unknown.
ο The major problem with nonprobability sampling is that sampling bias can occur.
ο Nonprobability sampling can be:
While "population" is about the generality of the universe or groups of people, "sample" refers to a fraction of persons from the population.
It is from the sample that data is collected in the course of a study, and because that sample is representative of the population, the results can be generalized to the population in a scientific study.