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Every individual has an equal chance of being selected, ensuring fairness.

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Population is divided into strata, and then random samples are taken from each stratum for better representation.

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A subset of the population chosen for study due to practicality and efficiency.

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Population is divided into clusters, and entire clusters are randomly selected for study, useful when natural groupings exist.

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Every 9th individual is selected from a list after a random starting point.

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Individuals are chosen based on ease of access, often leading to biased results.

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Participants self-select to be part of the study, introducing bias.

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Some groups in the population are not represented in the sample.

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When selected individuals do not participate, leading to an unrepresentative sample.

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Participants provide inaccurate information due to social desirability or other factors.

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Includes the entire population, providing a complete and accurate picture.