alleryEqually able groups answering one item differently signals what?
AHigh reliability
BRising norms
CMental age gain
DMeasurement bias
Answer & Solution
Correct answer: D. Measurement bias
1. Recall the fact: Differential item functioning is measurement bias in a test item.
2. The option "Measurement bias" matches it.
3. Why the others fail: Reliability, norms and mental age do not describe this pattern.
4. Check the stem wording against the fact: only one option satisfies both.
_Source: Wikipedia, "Intelligence quotient" (CC BY-SA, rev 1379872450), section "Test bias or differential item functioning"_
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