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Probability Sampling: Definition Probability Sampling is a sampling technique in which sample from a larger population are chosen using a method based on the theory of probability. For a participant to be considered as a probability sample, he/she must be selected using a random selection.  The most important requirement of probability sampling is that everyone in your population has a known and an equal chance of getting selected. For example, if you have a population of 100 people every person would have odds of 1 in 100 for getting selected. Probability sampling gives you the best chance to create a  sample  that is truly representative of the population. Probability sampling uses statistical theory to select randomly, a small group of people   (sample ) from an existing large population and then predict that all their responses together will match the overall population. Click here to learn about survey sample size Types of Probability Sampling Simpl...