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The objective of this research was to find out the effectiveness of vocabulary tree technique in developing vocabulary mastery of seventh grade students of SMP Negeri 2 Una-una. The advantages of vocabulary tree technique are the students are interested in the material, therefore; the students develop their vocabulary mastery fast and remember the words easily, and the students can construct the sentences by using their own words. The research method used true experimental research design. The population of this research was the seventh grade students of SMP Negeri 2 Una-una and the sample was the seventh grade students of class A. The number of the sample was 28 students selected by using random sampling technique. The mean score of experimental class post-test was 33 and the mean score of control class post-test was 11. The standard error of the difference between two means was 2.342. The t-ratio was 8. The degree of freedom for an independent t-test was 54 and the row was found 2.000. The number 2.000 in column labeled .05 indicated that under a true hypothesis and 54 degrees of freedom a t-ration of ± 2000 or more would exist by chances 5 percent of the time. The observed 8 was greater than 2.342, which means that tcounted was higher than t-table. Based on this fact, the null hypothesis was rejected and the hypothesis was accepted because there was a significant difference between students learning vocabulary through vocabulary tree technique than those who are learning vocabulary through traditional technique. It is concluded that vocabulary tree technique has significant influence in developing vocabulary mastery of the seventh grade students at SMP Negeri 2 Una-una.

DEVELOPING VOCABULARY MASTERY OF THE SEVENTH GRADE STUDENTS THROUGH VOCABULARY TREE TECHNIQUE