When H&C Research Corporation wanted to test the popularity of a new flavor of ice cream,they selected a number of U.S.cities as test sites,and then randomly selected supermarkets within those cities as trial vendors.This is an example of quota sampling.

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This is an example of cluster sampling, not quota sampling. Quota sampling involves selecting a specific number or percentage of individuals from different demographic groups in the population, whereas cluster sampling involves selecting groups (in this case, cities) from the population and then sampling within those groups.

When H&C Research Corporation Wanted to Test the Popularity of a New