Identify a true statement about test-retest reliability estimates. Multiple choice question. This estimate allows a test user to estimate internal consistency reliability from a correlation of two halves of a test. This measure is used when it is impractical or undesirable to assess reliability with two tests or to administer a test twice. This estimate is obtained by correlating two pairs of scores obtained from equivalent halves of a single test administered once. This measure is appropriate when evaluating the reliability of a test that purports to measure something that is relatively stable over time