Placing a sample bar of soap in every mailbox within a 10-block area is an example of ________ sampling.

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Direct sampling involves contacting potential respondents directly, such as mailing samples or questionnaires to their homes or workplaces. Placing a sample bar of soap in every mailbox within a 10-block area is an example of direct sampling, as the soap is being delivered directly to the potential customers' mailboxes. Cross-ruff sampling involves selecting respondents from different sources or locations, selective sampling involves intentionally selecting certain subgroups of the population, and response sampling involves selecting respondents based on their previous responses to a survey.

Placing a Sample Bar of Soap in Every Mailbox Within