THE CONSTRUCTION OF FOUR-TIER DIAGNOSTIC TEST ON ENGLISH GRAMMAR ABILITY FOR MATHAYOMSUKSA 3 STUDENTS
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Abstract
The objectives of this research were 1) to construct and examine the quality of a four-tier diagnostic test on English grammar ability. and 2) to study English grammar deficiencies. The sample consisted of Mathayomsuksa 3 students currently studying in the second semester of the 2025 academic year from schools under the Secondary Educational Service Area Office Sukhothai 870 students, this was divided into two phases: phase 1the pilot testing to explore learning disabilities 240 students. Phase 2 the pilot testing of a diagnostic test to determine the quality of the instruments 395 students, and the sample for data collection 235 students. The research instruments included 1) a test used to explore students’ grammar deficiencies 2) a four-tier diagnostic test on English grammar ability. The research findings indicate that 1)The construction and examination of the four-tier diagnostic test on English grammar ability for Mathayomsuksa 3 students consisted of in 42 items. Each item comprised four tiers: Answer tier (A-tier), Confidence of Answer tier (CA-tier), Reason tier (R-tier), and Confidence of Reason tier (CR-tier). And the quality of the diagnostic test showed that the Index of item-objective congruence (IOC) ranged from 0.60 - 1.00. The difficulty index at the answer tier ranged from 0.29 - 0.79 and at the reason tier from 0.22 - 0.74. The discrimination index at the answer tier ranged from 0.21 - 0.80 and at the reason tier from 0.24 - 0.70. The reliability was calculated using the Kuder–Richardson Formula 20 (KR-20) was 0.93 for the Answer tier (A-tier) and 0.87 for the Reason tier (R-tier). and 2) The results of the investigation into English grammar deficiencies of Mathayomsuksa 3 students found that majority of students were classified in the misconception group. The most misconceptions were found in the topic of verb to be agree with the subject, asking and answering questions to provide information using the Past Simple Tense and Past Perfect Tense.
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