The Development of a Modified Essay Question Test of Biology Problem-Solving Ability for Grade 10 Students by Applying Polytomous Item Response theory
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Abstract
The purposes of this study were to construct and validate the Modified Essay Question Test of biology problem-solving ability for Grade 10 students by applying polytomous item response theory and to establish norms. The sample comprised 540 Grade 10 students selected through multi-stage sampling. The students selected were studying under the jurisdiction of the Secondary Educational Service Area Office Pattani, Yala, and Narathiwat. The research instrument was the Modified Essay Question Test of biology problem-solving ability for Grade 10 students, consisting of 20 items covering four situations. The index of item objective congruence (IOC) ranged from 0.80 to 1.00, the difficulty ranged from 0.37 to 0.70, the discriminatory power ranged from 0.20 to 0.47, and the reliability was 0.83. The value of the Discrimination Parameter (αi) from stages 1 to 5 according to the scientific method ranged from 0.42 to 1.79. The value of the Difficulty Parameter (δij) ranged from -1.12 to 30.14. The test information had the highest value when the students had a medium level of biology problem-solving ability. The norm of Biology problem-solving ability percentile rank was from 3.80 to 96.10, and t-score ranged from 15 to 69.
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