A Comparison of Thai Language Learning Achievement of Prathomsuksa 1 Students Taught by the Supplementary Reading Book of Thai Language: Transformed and Inherent Vowels Entitled Noodee-Sounding the Vowels and Normal Teaching Method

Abstract

The purposes of this research were 1) to find the effectiveness of the supplementary reading book of Thai Language: transformed and inherent vowels entitled Noodee-Sounding the Vowels for prathomsuksa 1 students, according to the criteria of 80/80, and 2) to compare the learning achievement of Thai language for prathomsuksa 1 students taught by the supplementary reading book of Thai Language: transformed and inherent vowels entitled Noodee-Sounding the Vowels and normal teaching method. This research was quasi-experimental research. The population were prathomsuksa 1 students from 2 classrooms in 2023 at Ratchamontri School (Plueme –Chueamnukul) who were selected by using simple random sampling: drawing lots. The selected groups were prathomsuksa 1/4 and 1/3 students who were taught by the supplementary reading book and normal teaching method respectively. The instruments used included 1) the supplementary reading book of Thai Language: transformed and inherent vowels entitled Noodee-Sounding the Vowels, 2) transformed and inherent vowels lesson plans, and 3) a 30 – item with 3 multiple – choice achievement test with a reliability at 0.81. The statics used were average, standard deviation, difficulty, discrimination, reliability and independent sample t–test. The findings were 1) the efficiency of the supplementary reading book of the supplementary reading book of Thai Language: transformed and inherent vowels entitled Noodee-Sounding the Vowels was 81.33/83.56, and 2) the learning achievement of the experimental group (prathomsuksa1/4 students) using the supplementary book was higher than the control group (prathomsuksa 1/3 students) using normal teaching method at the statistical significance level of .05.