Which of the following is not a characteristic of a good achievement test?

Concept

A good achievement test should measure the intended learning outcomes consistently and fairly. Reliability concerns score consistency, validity concerns whether score interpretations support the intended use, and objectivity limits the influence of a scorer's personal judgment. Clear, unambiguous wording is essential because multiple interpretations reduce measurement quality.

Application

Reliability, objectivity, and validity are recognized qualities of a well-designed achievement test. Ambiguity permits more than one reasonable interpretation of an item, so a student's response may reflect interpretation rather than achievement.

Contrast

• Reliability concerns the consistency of scores across comparable administrations or scorers.

• Objectivity concerns scoring that is minimally influenced by the scorer's personal judgment.

• Ambiguity concerns wording or content that permits more than one reasonable interpretation.

• Validity concerns whether evidence supports the intended interpretation and use of test scores.

Cross-check

If an item is ambiguous, two equally prepared students may respond differently because they interpret it differently; the score then reflects more than achievement alone. Therefore, the required value is Ambiguity.