Parallel forms reliability example5/24/2023 In addition, although two tests might seem equivalent, a different question here and there might results in the test measuring completely different constructs. Proving that two tests are parallel is practically impossible (Furr & Bacharach, 2008) Although interpreting correlations is theoretically possible, it isn’t usually a feasible “real life” option. That said, you can only interpret correlation between tests in a meaningful way if the alternate forms are also parallel. This isn’t a requirement for alternate forms reliability, which just uses different versions of the same test. Parallel forms are very similar, but with one major difference: the observed score has the same mean and variance. A test would be deemed reliable if differences in one test’s observed scores correlate with differences in an equivalent test’s scores. Two equivalent (but different) tests are administered, scores are correlated, and a reliability coefficient is calculated. Is the test you’re administering reliable? Alternate forms reliability is a measure of reliability between two different forms of the same test. Reliability and Validity > Alternate Forms Reliability
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