Scenario C: The manager of a condominium complex wants owners’ opinions regarding whether to add a fitness room or add a hot tub to the property. Rather than ask the owner of every unit, he surveys all the owners from the 6th and 15th floors. This is an example of .

The manager surveys owners from two entire floors, treating each floor as a group and selecting those groups to represent the condominium. This is cluster sampling, so the correct choice is “cluster sampling.” Stratified sampling would involve dividing owners into groups and randomly sampling owners from every group, rather than surveying all owners in selected groups.

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