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One way to get valid and reliable data is to create a questionnaire with a list of statements about a topic. In questionnaires, respondents are asked to give their answer on a five-point Likert scale. The list of statements is supposed to measure a construct. To statistically test whether the construct has been measured correctly, a form of factor analysis is performed. And to test whether the construct has been reliably measured, Cronbach's alpha must be calculated.

This, in a nutshell, is the essence of why factor analysis should be applied and Cronbach's alpha should be calculated. You can read all about it, including wrong visions about this, in our paper.

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