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Standard Error of Measurement (SEM)
Definition
A statistical concept reflecting the fact that any single IQ test score is an estimate, not an exact measure, of a person's true intelligence. Because tests are imperfect, a score of 72 with a standard error of ±5 actually represents a range of roughly 67 to 77, meaning the person's true IQ could fall anywhere in that band.
Examples
- •Three of Smith's five IQ scores fell within the SEM of 70, meaning their error ranges extended below 70.