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RELIABILITY OF NRTs

RELIABILITY OF NRTs. -The extent to which the results of tests can be considered consistent or stable. The degree to which a test is consistent, or reliable can estimated by calculating a reliability coefficient (r xx ). Three Basic Strategies.

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RELIABILITY OF NRTs

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  1. RELIABILITY OF NRTs -The extent to which the results of tests can be considered consistent or stable. The degree to which a test is consistent, or reliable can estimated by calculating a reliability coefficient (rxx)

  2. Three Basic Strategies Three Basic Strategies to estimate the reliability of tests: (1) Test-retest (2) Equivalent-forms Reliability (3) Internal-consistency Reliability (Split-half reliability)

  3. STEPS IN CALCULATING THE RELIABILITY 1. Calculate Mean of the test scores 2. Calculate Standard deviation of the test scores. 3. Use One of these Formulas: (a) K-R21 (b) K-R20

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