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Table 3 Classical analysis and Rasch model parameters for both tests

From: Evidence of probability misconception in engineering students—why even an inaccurate explanation is better than no explanation

Task

Classical analysis

Rasch model

Task difficulty

Index of discrimination

Task difficulty

Test 1

Test 2

Test 1

Test 2

Both tests together

Maternity hospital

0.19

 

0.25

 

1.39

Lotto

0.40

0.30

0.38

0.36

0.60

Mobile phones

0.20

 

0.35

 

1.33

IT engineer

0.27

0.36

0.38

0.31

0.76

R/W balls

 

0.10

 

0.20

2.02

Lawyer

 

0.06

 

0.26

2.56