Sampling scheme in which each possible sample has the same probability of being selected

A random sample in which each of the n subjects (or objects) in the sample has an equal chance of being selected.

In statistics, a simple random sample is a group of subjects (a sample) chosen from a larger group (a population). Each subject from the population is chosen randomly and entirely by chance, such that each subject has the same probability of being chosen at any stage during the sampling process. This process and technique is known as Simple Random Sampling, and should not be confused with Random Sampling.