Which of the following is the best way to conduct a study? Mail questionnaire, telephone interview, and personal interview.

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pohnpei397 | College Teacher | (Level 3) Distinguished Educator

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This depends on what sort of a study you are trying to conduct.  A mail questionnaire is certainly the best for a study in which you need to ask a lot of people questions that are easily answered.  However, if you need fewer respondents and have more in-depth questions, a personal interview might be best.

A questionnaire has the advantage of being a cheap and easy way to contact a lot of people.  It is much easier than trying to contact a large number of respondents, even by phone.

Personal interviews and phone interviews are both good because they can allow you to ask in-depth questions and to interact with the respondent.  Personal interviews give you a better rapport with the respondent and can therefore help get them to be more open with you.  However, phone interviews are easier to arrange and cheaper/easier to conduct since you need not travel to get to the interview site.

With these advantages in mind, you would have to look at what sort of a study you are doing to determine which method is best for you.

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