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| Construction, Validation And Application Of Agricultural Science Achievement Test With Rasch Measurement Model
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EDHEBE, Ikiehoke John, Prof. P. U. Osadebe and Dr. P. A. U. Ossai
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Abstract:
This research aimed at the development and validation of Agricultural Science Achievement Test using the Rasch model. Four research questions guided the study. The researcher used the instrumentation research design. The population of this study is made up of 20,494 Senior Secondary School three (SS3) students in both Delta and Edo states. A large sample of 1500 testees selected using multistage sampling technique. Agricultural Science Achievement Test (ASAT) was used for the collection of data. The researcher generated 100 questions/items using the table of specification which cut across all the topics required by WASSCE and NECO syllabi. The items were also vetted by experts. Factor analysis using the PCA for item analysis was carried out on the 100 items to select, review, re-write and edit the final test to be administered. The table of specification and the specialists in Agriculture and measurement and evaluation were used to establish the content validity and the face validity of the generated items. The KR-20 was used to establish the reliability of the test items. The 100 items were used to gather data from the field. The data gathered were then subjected to Rasch analysis. Results showed that ASAT was adequate in measuring the Achievement construct regarding the individual item provided enough contribution to the overall measurement of Agricultural Science Achievement Test items and equally established unidimensionality trait and local independence of the items
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