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Abstract
The study investigated the determination of aberrant examinees of 2018, 2019 and 2020 May/June Biology multiple choice test questions of the National Business and Technical Certificate Examination (NABTCE) in Nigeria. Aberrant examinees are examinees who fall into the category of giving responses that are incongruence with their ability level. When there is a mis match between the observed response pattern of an examinee to his expected response pattern, the examinee is said to have responded aberrant. Specifically the study investigated the level of aberrant examinees in the 2018, 2019 and 2020 NABTCE Biology multiple choice test, the internal consistency reliabilities before and after screening the data of aberrant examinees and the differences between the aberrant and the non aberrant examinees for each year. To achieve the objectives of this study, nine research questions were raised, while three hypotheses were tested at 0.05 level of significance. This research adopted the survey research design of the expost facto. The population for the study was 88,768 Biology students responses which consisted of 28121, 29254 and 31411 for 2018, 2019 and 2020 students’ scored responses respectively. The sample size for the study was 20263. This comprised of 7086, 6447 and 6730 examinees’ responses for the 2018, 20019 and 2020 NABTCE Biology. A multistage sampling technique was adopted for the study, in which a stratified sampling technique, simple random sampling technique and a cluster sampling was applied for effective selection. The instrument used was the NABTCE May/June Biology multiple choice test questions for 2018, 2019 and 2020 made up of fifty items and four options each. The instruments were assumed to be valid and reliable as it was a test constructed by a public examination body. Principal Component Analysis (PCA) of factor analysis was used to determine the unidimensionality of the instruments.
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