Construction and Validation of a General Science Aptitude

Topics: Psychometrics, High school, Secondary education Pages: 13 (4334 words) Published: January 4, 2011
Ilorin Journal of Education, Vol. 27 August, 2007 CONSTRUCTION AND VALIDATION OF A GENERAL SCIENCE APTITUDE TEST (GSAT) FOR NIGERIAN JUNIOR SECONDARY SCHOOL GRADUATES Ariyo, Akinyele Oyetunde (PhD), International Centre for Educational Evaluation, Institute of Education, University of Ibadan, Ibadan, Nigeria. aoariyo@yahoo.com +2348034292924 Abstract

This paper is a report of a study whose major purpose was to develop and validate a General Science Aptitude Test (GSAT) for Junior Secondary School graduate seeking admission into senior secondary school one in Nigeria. The specific objectives were to describe the various stages in the development and validation of GSAT and also to determine the psychometric properties of the instrument. The Pearson Product Moment Correlation, Test difficult index, discriminative index and the KuderRichardson 21 statistics were used for the analysis of results. The results of analysis show that the GSAT was moderately difficult for the sampled students (average item difficult is 0.39), while the instrument was found to be reliable since internal consistency was found to be 0.90. The inter-correlation among the GSAT‘s sub-scales was found to be substantial .GSAT is recommended for use in other parts of the world. Introduction There is a strong agreement among educationist and psychologist on the utility of aptitude tests in the process of educational and vocational decisions, about placement, streaming, admission and classification of students and job seekers (Gay, 1980; Macklem, 1990). According to Gay (1980), aptitude tests help the teacher to test more realistic expectations of students’ abilities and facilitate the identification of under achievers. The terms intelligence, ability, and aptitude are often used interchangeably to refer to behaviour that is used to predict future learning or performance. However, subtle differences exist between the terms. The tests designed to measure these attributes differ in several significant ways. Like intelligence tests, aptitude tests measure a student's overall performance across a broad range of mental capabilities. But aptitude tests also often include items which measure more specialized abilities such as verbal and numerical skills--that predict scholastic performance in educational programs. Compared to achievement tests, aptitude tests cover a broader area and look at a wider range of experiences. Achievement tests tend to measure recent learning and are closely tied to particular school subjects. Aptitude tests tell us what a student brings to the task regardless of the specific curriculum that the student has already experienced. The difference between aptitude and achievement tests is sometimes a matter of degree. Some aptitude and

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Ariyo, Akinyele Oyetunde

achievement tests look a lot alike. In fact, the higher a student goes in levels of education, the more the content of aptitude tests resembles achievement tests. This is because the knowledge that a student has already accumulated is a good predictor of success at advanced levels. In literature there is no single definition of aptitude. Some investigators defined aptitude as the characteristics of a person that are regarded as indices of his capacity to acquire, through future training some specific set of responses (Aiken, 1988; Gronlund, 1981). On the contrary some other investigators see it as natural or innate capacity for a particular performance (Yejide, 1973; Thorndike & Hagen, 1977). Aptitude tests are cognitive (intellectual) measures used to predict future performance in some activities such as school learning and other forms of accomplishment (Aiken, 1988; Gronlund, 1981; Sax, 1980). Aptitude tests are widely used in schools and industries. Teachers might want to administer aptitude test to help them identify students who have potential to perform well in physics in the future so that they could be offered physics instruction. This is in line with previous...

References: Anatasi, A. (1982). Psychological testing (5th ed.). New York: Macmillan. Aiken, L. R. (1988). Psychological testing and assessment (6th ed.). Boston: Allyn and Bacon, Inc. Ariyo, A.O. (2006). School and student factors as determinants of students’
achievement in physics at the senior secondary school level in oyo
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state, Nigeria. An Unpublished Ph.D. Thesis, University of Ibadan, Ibadan. Bakare, C. M. G. (1972). The standard progressive matrices scale. Ibadan:
University of Ibadan Press. Bloom, B. S. (1976). Human characteristics and school learning. New York: M.C. McGraw-Hill Coley, W. W. (1958). Attributes of potential scientists. Harvard Education Review, 28, 1- 818. Gagne, R. M. Briggs, L.J. (1979). Principles of instructional design. New York: Holt, Rinehart and Winston. Gay, L. R. (1980). Educational evaluation and measurement. Ohio: Meri Publishing Co. Gronlund, N. E. (1981). Measurement and evaluation in teaching. New York: Macmillan Publishing Co. Horrocks, J., & Schoonover, T. I. (1968). Measurement for teachers. Ohio! Meri Publishing Co. Iketuonye, A. I. (1986). Experimental differences in tested aptitudes. Nigerian Journal of Counselling and Development, 1 (2). 20 - 32. Macklem, Gayle L. (1990). Measuring aptitude. Practical Assessment, Research and Evaluation, 2(5). Retrieved September 8, 2007 from http://PAREonline.net/getvn.asp?v=2&n=5 Mccarthy, M. (1973). Wechsler’s adult intelligence scale: a pilot study in a Nigerian technical college. West African Journal of Education, 15(2), 12 - 20 Ohuche, N. M. & Ohuche R.O. (1973). The draw-a man test as a predictor of academic achievement. West African Journal of Education and Vocational Measurement 1, (1) 14 –20. Sax, G. (1980). Principles of educational psychological measurement and evaluation. (2nd ed.) California: Wadsworth Publishing Co. Soriyan, M.A. (1978). Importance of aptitude and interest in vocational guidance. W.A.E.C. News. Lagos: The Triangle Enterprises, Nigeria Limited. Thorndike, R. L. & Hagen, E. P, (1977). Measurements and evaluation in psychology and education. New York: John Wiley & Sons INC. Tittle, C. K. (1984). Test bias. In T.N. Hussen & T. Postlethwaite (Eds.).International encyclopedia of education, 5199 – 5204. Vernon P.A. (1961). The measurement of abilities (2nd ed.). London: Methuen Publishing Co. Yejide, A. (1973). Indicators of science Aptitude in some Nigerian secondary girl schools. Unpublished M .Ed Thesis, University of Ibadan, Ibadan. W.A..E.C. NEWS (1989). A House Journal of West African Examinations Council, 3(1). Lagos: WAEC Yejide, E. A. (1973). Indicators of science aptitude in some Nigerian secondary girls schools. Unpublished M.Ed. thesis, University of Ibadan, Nigeria. Yoloye, E. A. (1973) The predictive validity of Lorge-Thorndike intelligence tests for achievement in Nigerian grammar schools. West African Journal of Education and Vocational Measurement 1, (1), 48. 29
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