<![CDATA[Rindayani Surbakti, 2025. Improving Students' Vocabulary by Using Blending Words of Class X Students of SMAN 5 Tanjungbalai in the 2024/2025 Academic Year. Thesis. English Education Study Program, Faculty of Teacher Training and Education, Asahan University. Advisor: Derliana Hasibuan, M.Hum. The purpose of this study is to determine the extent to which the use of blending words technique can improve students' vocabulary mastery. This study is a quantitative research conducted on one class which is divided into two groups, namely the experimental group and also the control group. The population of this study amounted to 237 students with a sample size of 66 students from classes X1 and X2. The instrument used to collect data is a test. The instruments used to collect data are multiple choice tests and matching questions. Based on the results of data analysis using the t-test, the calculated t value (tₕ) was 3.814. Then the null hypothesis (H₀) is rejected and the alternative hypothesis (Hₐ) is accepted. Therefore, it can be concluded that this study is successful, that the use of blending words significantly improves the vocabulary mastery of students of class X SMAN 5 Tanjungbalai in the academic year 2024/2025. Keyword: Problem Based Learning Model, Blending Words, Vocabulary.]]>
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