Skip to main content

Table 6 Difficulty and discrimination values for the questions in the instrument

From: A valid assessment of students’ skill in determining relationships on evolutionary trees

Question Distracter Difficulty Discrimination
1 Node counting 0.50 0.55
2 Similarity 0.79 0.42
3 Proximity 0.66 0.54
4 None 0.80 0.53
5 Similarity 0.70 0.56
6 Proximity 0.70 0.57
7 None 0.61 0.67
8 Node counting 0.67 0.56
9 Similarity 0.60 0.60
10 None 0.77 0.59
11 None 0.60 0.69
12 Proximity 0.53 0.76
13 Similarity 0.77 0.49
14 Node counting 0.54 0.73
15 Proximity 0.52 0.75
16 None 0.66 0.70
17 Multiple 0.46 0.61
18 Multiple 0.60 0.67