Traditional True Test Score Theory (TTTST) Analysis of Oyo State Junior Secondary School Certificate Multiple-Choice Mathematics Item Parameter Estimates.

The study examined the item parameter indices of students’ responses to the Oyo State Junior Secondary School Certificate Examination in Mathematics using the Traditional True Test Score procedures. The study adopted a descriptive survey design. A sample of 600 students was randomly selected from a population of 95,419 students who sat for the JSSCE Mathematics Paper 1 in Oyo State, Nigeria. The tool adopted for the survey was the 2016 Oyo State JSSCE Mathematics Paper 1 titled Mathematics Test (MT). The reactions of examinees to the trial were analysed using SPSS. The value of Cronbach-α obtained was 0.73, reflecting how students could answer other items along with the test suitably. 70% of the test items discriminate poorly (0.10 ≤ D ≤ 0.29) reflecting how the mathematics test discriminates poorly among examinees who understand the material being tested and those who do not, while 31.67% of the items had acceptable item-total correlation (rpb> 0.30). The study concluded that the Oyo State 2016 JSSC Mathematics Test was of moderate psychometric quality, based on its measurement indices. It was urged that the Oyo State examination section should adopt other 21 st-century innovative procedures for newly developed test items analyses in identifying other areas of mathematics content that demand greater attention or clarity in ensuring test security and uniformity over time.