As the reliability of an instrument increases, the standard error of measurement decreases.
What is standard error of measurement?
- The estimation of how repeated measures of a person on the same instrument that is distributed around the “true” score is known as the standard error of measurement (SEm).
- The true score is unknown because no measure can be constructed that provides a perfect reflection of the true score.
- SEm is directly associated with the reliability of a test; that is, the larger the SEm, the lower the reliability of the test and therefore the less precision there is in the measures taken and scores obtained.
- Since all measurement contains some error, it's highly unlikely that any test will yield the same scores for a given person each time they are retested.
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