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Table 2 BAQ items sorted into 5 classes showing their psychometric properties

From: How important is distractor efficiency for grading Best Answer Questions?

Classes Mean DIFi
(SD) and range
Mean DISi
(SD) range
n and (% of items) Mean FDs/item (SD) and range
A
(excellent)
0.53 (0.05)
0.43–0.59
0.47 (0.07)
0.4–0.59
9 (2.57) 2.44 (0.53) 2–3
B
(good)
0.58 (0.14)
0.31–0.79
0.3 (0.1)
0.15–0.64
122 (34.86) 2.3 (0.91) 1–4
C
(fair)
0.6 (0.31)
0.08–0.93
0.23 (0.07)
0.15–0.50
61 (17.43) 2.07 (1.14) 0–4
D
(remediable)
0.68 (0.29)
0.04–0.99
0.08 (0.04)
0.01–0.14
90 (25.71) 1.42 (1.19) 0–4
E
(discarded)
0.61 (0.33)
0–1
-0.02 (0.05)
-0.20–0
68 (19.43) 1.45 (1.17) 0–4
  TOTAL 350 (100) 654/350 = 1.87
  1. BAQ best answer questions, DIFi difficulty index, DISi discrimination index, DE distractor efficiency, FD functional distractors