Testing Reliability &Validity

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What is questionnaire It is set of questions for gathering information from individuals. It is series of questions asked to obtain statiscally useful information about a given topic . When properly administered, questionnaire become a vital instrument by which statements can be made about specific groups or people or entire population. You can administer questionnaires by mail, telephone, using face-to-face interviews, as handouts, or electronically (i.e., by e- mail or through Web-based questionnaires).

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