Under what condition should Cronbach's alpha coefficient be used to establish the internal consistency of an instrument?

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Cronbach's alpha coefficient is commonly used to establish the internal consistency of an instrument that uses a Likert-type response scale. This is because Likert-type scales measure the degree of agreement or disagreement with statements or questions that have multiple response options. Cronbach's alpha coefficient assesses the extent to which these response options are measuring the same construct or concept.

Under What Condition Should Cronbach's Alpha Coefficient Be Used to Establish