Random sampling occurs when each unit in the sample frame has a known positive probability of being included in the sample. Then units are selected randomly using a computer or random number table and the assigned probabilities. This type of sample is also called probability sampling.
A method of selecting households for verification in which the school district counts all of the applications on file as of October 31st of each school year, multiplies by 3%, and rounds upwards. Applications are randomly selected from those on file until the entire sample is selected.
the selection of a sample from a population so that each member of the population has an equal chance of being included. (43)