A convenience sample is sometimes used in exploratory research, but never in definitive studies.

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A convenience sample is a non-probability sample that is used when it is not possible or practical to obtain a random sample. Convenience samples are often used in exploratory research because they are quick and easy to obtain. However, they are not considered to be reliable for definitive studies because they may not be representative of the population.

A Convenience Sample Is Sometimes Used in Exploratory Research, but Never