The statistical model is put forward to test the accuracy of itemdifficulty indexes in the test papers given by the educational experts.
提出一个统计模型,用于检验试题库中由专家给出试题难度这一指标的准确性。
2
By far the biggest difficulty facing the arabs-and the main item in the catalogue of socio-economic woes submitted as evidence of looming upheaval-is demography.