THE CONSTRUCTION OF THE COMPETENCY TEST TO EXPLAIN PHENOMENA SCIENTIFICALLY FOR MATTHAYOMSUKSA 3 STUDENTS UNDER THE SECONDARY EDUCATIONAL SERVICE AREA OFFICE NONGKHAI

Abstract

         The purposes of this research were 1) to construct and assess the quality of the competency test to explain phenomena scientifically. 2)to construct a norm of scores from the competency test to explain phenomena scientifically. 3)to construct a manual for using the competency test to explain phenomena scientifically. The sample consisted of 601 Matthayomsuksa 3 students under the Secondary Educational Service Area Office Nongkhai in the second semester of the 2021 academic year selected by multi-stage random sampling. The samples were divided into two groups: the first group of 150 students assessed the difficulty and discrimination of the test, and the second group of 451 students confirmed the quality of the test. The research instrument was the competency test to explain phenomena scientifically.

         The findings of this research were as follows:1.The construction of the competency test to explain phenomena scientifically is a situational test, and the test was the multiple-choice with four options. The value of the Index of Item Objective Congruence (IOC) was between 0.60 - 1.00. The difficulty value of the items and the value of the discrimination were between 0.55-0.77 and 0.20-0.39 respectively. The reliability of the test which was calculated by the Kuder-Richardson Formula 20 (KR-20) was at 0.76.2.The norm for interpreting scores of the competency test to explain phenomena scientifically consisted of six levels: very good, good, fair, medium, low and should be developed. The normalized T – Score ranges from T₅ to T₇₃.3. The manual for using the competency test to explain phenomena scientifically was suitable and included all the important components. The examination of the manual validity by five experts had a Content Validity Index (CVI) of 0.88.