Sixty percent of a test's variance is caused by the variance of true scores, whereas 40% of the variance is caused by error. What is the test's reliability?

Name: Sixty percent of a test's variance is caused by the variance of true scores, whereas 40% of the variance is caused by error. What is the test's reliability?
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The Answer of Sixty percent of a test's variance is caused by the variance of true scores, whereas 40% of the variance is caused by error. What is the test's reliability?

Sixty Percent of a Test's Variance Is Caused by the Variance