Which statement best describes why true scores are useful in interpreting assessment results?

• A. They serve as the best estimate of what the score would be if measurement error were eliminated.
• B. They are always identical to observed scores.
• C. They ignore measurement error.
• D. They are only useful for normative comparisons.

Answer: (A)

True scores reflect the hypothetical score someone would achieve on the underlying construct if measurement error were eliminated. In measurement theory, an observed score equals the true score plus some random error, so the true score provides the most accurate estimate of the learner’s actual level. Because error can make results look higher or lower than the real ability, using true scores helps interpret results more faithfully. They’re not identical to observed scores, since error exists; they don’t ignore error in theory, they separate it; and while useful for comparisons, they’re not limited to normative contexts—they represent the actual construct across interpretations.