A. 0.30 – 1
B. 1
C. 0.30
D. None
Answer is = B
- A discrimination power value ranging from 0.30 to 1 is generally considered acceptable.
Within this range:
- Values closer to 1 indicate stronger discrimination power.
In an ideal scenario, a test item would have a discrimination power of exactly 1. This signifies:
- Perfect discrimination: All high-performing test-takers answer the item correctly, and all low-performing test-takers answer it incorrectly.
Therefore, the answer is B. 1.
While a discrimination power of 1 is the theoretical maximum, it’s uncommon in real-world testing situations. Actual test items will likely have values within the broader acceptable range of 0.30 to 1.