Local government officials would like to know if city residents are generally satisfied with the cleanliness of local streets and recreation areas. To estimate the level of satisfaction, the officials are considering many methods to collect information. Which of the following methods would not provide a voluntary response sample?

A voluntary response sample consists of people who choose on their own to respond, as with an online survey, a mail-in newspaper survey, or calls to a radio show. In choice C, officials select homes at random and visit them to conduct the survey, so respondents are contacted through a sampling process rather than volunteering to take part. Therefore, the random home survey would not provide a voluntary response sample.

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