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This thesis is the effect of using jumble letters in teaching vocabulary in grade eight students of SMP Negeri 7 Pematangsiantar. In this thesis, the problem of the study justifies as “Does the use of Jumble Letters affect the students’ vocabulary achievement in grade eight students of SMP Negeri 7 Pematangsiantar?”To answer the problem, the writer follows some theories namely: Yule (2010: 117), Agoestyowaty (2007:38), Carten (2007:21), Nunan ( 2005:121), Bruner (1983: 112).This thesis is quantitative descriptive study design, because it is to find the effect of using jumble letters in teaching vocabulary. The subject of this study is the grade VIII students of SMP Negeri 7 Pematangsiantar. VIII10 which consists 20 students as control group and VIII8 which consists 20 students as experimental group. Total number of sample are 40 students.The objective of this study is to know the effect of using Jumble Letters on the students’ vocabulary achievement in grade eight students of SMP Negeri 7 Pematangsiantar. In analyzing, the data shows that the students’ vocabulary in grade VIII8 increases significantly. It shows by the improvement of the students’ score from the pre – test to post – test. In pre – test of experimental group, it shows that the mean (M) in pre – test is 65,the median is 62.5, the highest score is 75, and the lowest score is 60. While in post – test of experimental group, it shows that the mean (M) in post – test is 80.25, the median is 80, the highest score is 90, and the lowest score is 70.Based on the calculation of t – test, it was found out that t – observed is (8.46) and it is higher than t – table (1.66) at the level of significance (0.05). It means that there is a significant effect of using jumble letters in teaching vocabulary in grade eight students of SMP Negeri 7 Pematangsiantar. Since the result of t – observed is higher than t – table (8.46 > 1.66), the null hypothesis (Ho) is rejected and the alternative hypothesis (Ha) is accepted. It means that there is a significant effect of using jumble letters in teaching vocabulary in grade eight students of SMP Negeri 7 Pematangsiantar. Finally, the writer hopes that the research will help the students’ to increase their vocabulary. And the teachers are suggested to apply jumble letters as one of technique to increase the students’ vocabulary achievement.

The Effect of using Jumble Letters in Teaching Vocabulary in Grade Eight Students of SMP Negeri 7 Pematangsiantar