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Questionnaires
Written surveys that can be conducted face to face, by telephone, or post.
Bias
Prejudice in favor of or against one thing, person, or group compared with another, usually in a way considered to be unfair.
Open questions
Questions designed to elicit detailed and meaningful responses from respondents, allowing them to express their knowledge and feelings.
Closed questions
Questions that can be answered with a simple "yes" or "no" or specific information, limiting the depth of response.
Cost-effective
A practical advantage of questionnaires over face-to-face interviews, as they are cheaper and can reach a wide range of respondents quickly.
Note 
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