Researchers are conducting a survey about what brand of ice cream shoppers prefer. They survey the tenth person who walks into the store and then every fifth person after that. This type of sampling is called

Systematic random sampling selects people at a regular interval from a starting point. Here, the researchers begin with the tenth shopper and then survey every fifth shopper, so the method is systematic random sampling. Cluster sampling selects whole groups, while stratified sampling samples from separate subgroups.

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