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There are two important requirements that apply to a questionnaire, the questionnaire is imperative for valid and reliable. A questionnaire is said to be valid (valid) if the questions on the questionnaire were able to express / measure something that will be measured by a questionnaire be the aim of the questionnaire (accuracy). Meanwhile, a questionnaire is said to be unreliable (Andal) if someone answers to the questions are consistent or stable over time. When the measurement conditions change gauge that will reliably remain behave the same, namely to produce the same output. The questions in the questionnaire used as a variable and answers / opinions of each respondent is considered as a case or observation
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