The Effectiveness of Poster Media in Improving Students’ Vocabulary Mastery

Abstract

This study investigated the effect of poster media on students’ vocabulary mastery at the junior high school level. The research employed a quantitative approach using a pre-experimental one-group pretest–posttest design. The participants consisted of 35 seventh-grade students selected as the research sample. Data were collected through vocabulary tests administered before and after the implementation of poster media as an instructional tool. The data were analyzed using a t-test to determine whether the use of poster media produced a significant improvement in students’ vocabulary mastery. The results showed that the mean score of the pretest was 44.00 with a standard deviation of 17.01, while the mean score of the posttest increased to 64.69 with a standard deviation of 19.67. The statistical analysis revealed that the obtained t-value (5.93) was higher than the t-table value (1.69) at the 0.05 significance level, indicating a statistically significant difference between the pretest and posttest scores. These findings demonstrate that poster media has a significant positive effect on students’ vocabulary mastery. Therefore, the use of poster media can be considered an effective instructional medium to enhance vocabulary learning among junior high school students.