Cronbach's alpha (or tau-equivalent reliability) is a measure of the relationship between a group of questions. The group of questions is called a scale and each question in this group is an item. Cronbach's alpha is therefore a measure of the internal consistency of a scale and thus of the strength of its reliability.

More details on Cronbach's Alpha
https://datatab.net/tutorial/cronbachs-alpha

And the Cronbach's Alpha calculator
https://datatab.net/statistics-calculator/reliability-analysis/cronbachs-alpha-calculator

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