Test reliability provides an estimate of the stability and consistency of the measures.

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Test reliability is defined as the degree to which a measure is consistent and stable over time. It refers to the ability of a test to produce consistent and accurate results across multiple administrations or in different contexts. In other words, if a test is reliable, it should yield similar scores when administered to the same individuals at different times or by different raters. Reliability is an essential component of test validity and ensures that the results are dependable and trustworthy.

Test Reliability Provides an Estimate of the Stability and Consistency