A snowball sample is a form of cluster sampling in which areas such as census tracts or blocks serve as the primary sampling units.

Name: A snowball sample is a form of cluster sampling in which areas such as census tracts or blocks serve as the primary sampling units.
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Snowball sampling is a non-probability sampling technique used in research where existing study subjects recruit future subjects from among their acquaintances, not based on clusters like census tracts or blocks.

A Snowball Sample Is a Form of Cluster Sampling in Which