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If 80% of students answer a test item correctly, its difficulty index is:
A0.20
B0.50
C1.00
D0.80
Answer & Solution
Correct answer: D. 0.80
1. Difficulty index P = (number correct)/(total respondents).
2. P = 0.80 when 80% are correct.
3. Hence 0.80.
_Source: Trueman's UGC NET/SLET General Paper I (Manohar Pub.), 2010 — Item Analysis_