Mathematics is an essential subject for human existence on day-to-day activities. This is an indication that it if properly handed it could enhance national development. Therefore, in test items construction to examine students performance in the subject careful considerations must be given. The purpose of the study is to investigate unidimensionality of mathematics multiple-choice test items used for a joint mock examination in Kwara State public schools. The study adopted a descriptive research survey type. The population comprised students in Senior Secondary Schools while the target population consisted of Senior Secondary School II students. The multistage sampling technique that involved stratified, proportionate and simple random sampling was used at different stages of selections. The measuring device was the 2018/2019 Kwara State Joint Mock Mathematics Test. The test is a standardized test and thus the validity and reliability coefficients were not disclosed to the public. The statistical technique employed was factor analysis using SPSS 25.0 version. Tetrachoric correlation statistic was used to obtain 0.96 reliability coefficient. This study, therefore, concluded that only 41 (82%) of 50 multiple-choice items revealed evidence of unidimensionality. One of the recommendations was that those items that violated unidimensionality assumption should be revisited so that instrument could be 100% compliance to unidimensionality.
This paper investigated the structural robustness of the Life Satisfaction Scale (LSS) among Nigerian Pre-service Teachers. The study anchors on scale development research type of non-experimental design. Participants were selected randomly, totaling 509. The adopted instrument titled satisfaction with life scale with content validity index of 0.84 and ordinal alpha reliability of (α=0.75) aided in gathering data for the study. Obtained data were analysed using Exploratory Factor Analysis (EFA), Confirmatory Factor Analysis (CFA), and concurrent validity (that is equating with Rosenberg Self Esteem scale), respectively. The results showed that a single trait was evident in the scale, with Eigenvalues of 2.41, 0.97, 0.64, 0.53, and 0.44. Also, the CFA indicated a good fit to the data with compliance indices. A significant positive correlation of the LSS with the Rosenberg self-esteem scale (r=0.83, P<0.05) indicated acceptable concurrent validity. Similarly, LSS maintains its strict invariance regarding gender. The authors concluded that there was psychometric confirmation for a unitary structure of LSS in Nigeria, and since the two scales produced high correlations, the validity of LSS is referred to as concurrent. Therefore, it was recommended that LSS be used to complement scales that emphasise emotional well-being since it accesses an individual's conscious evaluative judgment of his or her life using personal criteria.
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