Assessing Questionnaire Reliability
Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts. We invariably use surveys because we want to measure something, for example, how frequently people exercise, voting intentions, the percentage of your customers that would recommend you to a friend. As such surveys can be viewed as a measurement instrument of, for example, behaviours, attitudes and opinions. Two important qualities of surveys, as with all measurement instruments, are consistency and accuracy. These are assessed by considering reliability and validity - in this blog we consider reliability.
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