John is a researcher interested in learning people's opinions about roles in marriage.He mails a questionnaire to a carefully selected group of people.What research method is he using?

Question

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John is using a survey as his research method by mailing a questionnaire to a group of people. A survey is a research method that involves collecting data through a set of standardized questions to a group of people to learn about their opinions, attitudes, or behaviors on a specific topic.

John Is a Researcher Interested in Learning People's Opinions About