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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