Types of Sampling

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What is a Cluster Sample?

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A sampling method where a population is divided into clusters (groups), and a whole cluster is randomly selected to represent the population.

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What is a Convenience Sample?

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A sampling method where samples are taken from a group that is easily accessible, rather than randomly selected.

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What is a Stratified Sample?

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A sampling method where the population is divided into subgroups (strata) and random samples are taken from each stratum.

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What is a Systematic Sample?

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A sampling method where you select every nth individual from a list or sequence.

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What is a Voluntary Sample?

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A sampling method where individuals choose to participate in the survey or study, often leading to self-selection bias.

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Example of a Cluster Sample:

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Surveying all students in a randomly selected lunch table to assess cafeteria food quality.

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Example of a Convenience Sample:

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Surveying teachers who are near the front office to determine meeting preferences.

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Example of a Stratified Sample:

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Randomly selecting two students from each classroom to evaluate the school's website design.

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Example of a Systematic Sample:

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Asking every tenth person at a soccer game about their attendance at community events.

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Example of a Voluntary Sample:

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Mailing surveys to all collegiate baseball coaches and using only the returned surveys.