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Table 16 Test-one analysis (number of students’ attempts = 126)

From: Evaluating the quality of the ontology-based auto-generated questions

Test statistics Value Description Desired values
Questions’ difficulty index average 0.525 Medium difficulty [0.3-0.9]
Questions’ discrimination index average 0.445 Satisfactory ≥0.3
Questions’ reliability average (point biserial coefficient) 0.266 Satisfactory ≥0.2
Test reliability index 0.540 Poor ≥0.7
Test discrimination power (Ferguson’s delta) 0.540 Satisfactory ≥0.9