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This measures the internal consistency on a scale. It is often used when you have multiple Likert questions in a questionnaire that form a scale and you wish to test the reliability of the scale. Example is when the answer of a question range from “strongly agree” to “strongly disagree”.
Procedure
From the reliability statistic table, A high value of Crohnbach’s alpha indicates a high level of internal consistency. The item-total-statistic table shows the value of Crohnbach’s alpha if the particular item was deleted.