An index of a test's internal consistency is

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The index of internal consistency is Split-half reliability. This index measures whether the different parts of a test are consistent with each other by dividing the test in half and comparing the scores between the two halves. If the scores are similar, then the test is considered to have high internal consistency. Test-retest reliability measures the consistency of scores over time, content validity measures whether the test covers the intended content, and convergent validity measures whether the test is related to other measures that it should theoretically be related to.

An Index of a Test's Internal Consistency Is