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An experimental study using a one-group pre-test post-test design was conducted with SMA Muhammadiyah Palopo students from five classes. A sample of 25 students from class X was selected through cluster sampling. Results show the mean pretest score of 52.52 increased to 80.64 on the posttest. 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This research applied experimental with one group pre-test posttest design. The population was the students of SMA Muhammadiyah Palopo that consist of five classes. Then, the sample taken were 25 students of class X by using cluster sampling technique. Based on the data analysis, it can be seen that the mean score of the pretest was 52,52 while the mean score of the posttest was 80,64. Furthermore, the significant value of paired sample test was smaller than the significant level (0,000 \u003C 0,05) . It means that the H1 was accepted and H0 was rejected. In conclusion, Hello English smartphone application significantly enhanced the students’ vocabulary mastery.  \nKeywords: Hello English 1; Smartphone Application 2; Vocabulary Mastery 3  \nIntroduction  \nWe are living in technology and information era where English is the most spoken language in the world. It has been the common language for decades (Mahu, 2012) . Nowadays, technology and information are developed rapidly. Since English is the global language as well asthe language of technology, English is very important to be mastered for anyone. Even in Indonesia, it becomes one of the compulsory subjects at school. English has four skills namely speaking, listening, reading, and  \nwriting. In order to master all the skills, vocabulary plays the important role in foreign language learning. Vocabulary is a list or collection of words and phrases usually alphabetically arranged and defined or explained (Merriam Webster, 2022) . Besides, Jack C. Richard and Willy (2022) said that vocabulary is the main component of language proficiency which provides much of the basis how well someone listen, speak, read, and write. It is the central of language teaching and is of paramount importance to a language learner (Alqahtani, M, 2015) . It is the first step to be taught before teaching other aspects of language. Without mastering the vocabulary, it will be difficult to express the ideas or the though, share information, understand what others are saying, even it will be difficult to grow personal relationship. It is supported by the statement from Rizky & Wiedarti (2020) that vocabulary is as important as other skills such as listening, speaking, reading, and writing. In reading skills, vocabulary helps the learners in comprehending the text. In writing, it helps them in expanding their ideas. In listening, it can facilitate the learners comprehending and understanding what others speaks. Meanwhile in speaking, it can help the learner to explain their ideas orally. It can show that when someone wants tolearn a language, the he should have a great mastery of vocabulary.  \nA learner should acquire a large number of words and have to know how to use them accurately to communicate effectively. Although students realize that vocabulary is very important in learning a language, most students learn vocabulary passively due to several factors (Ngunyen & Khuat Thi, 2003) . First, they find the teacher's explanation in terms of pronunciations, definition, spelling, and grammar functions. In this case, the students only enrich their vocabularies by listening to their teacher. Second, the students assume that learning vocabularies is just about finding out the meaning of new words. therefore, they ignore all other word functions completely. Third, sometimes the only acquire new vocabulary from their textbooks or dictionary. They are not realized yet that technology has provided them with a more authentic, interactive, and eco-friendly m","cbCaifmKm7y7B8RH","https://ap.wps.com/l/cbCaifmKm7y7B8RH","pdf",419703,"English","# Abstract\n# Introduction\n## Role of Vocabulary in Language Learning\n## Students’ Passive Vocabulary Learning Problems\n## Using Smartphone Application (Hello English)\n# Methodology and Results\n## Research Design\n## Pretest and Posttest Scores\n## Paired Sample Test Significance","[{\"question\":\"What is the purpose of this research?\",\"answer\":\"To enhance students’ vocabulary mastery through the Hello English smartphone application.\"},{\"question\":\"How was the study conducted?\",\"answer\":\"The research used an experimental one-group pre-test post-test design, with 25 students selected from class X using cluster sampling.\"},{\"question\":\"What were the results of the vocabulary mastery test?\",\"answer\":\"The mean score increased from 52.52 (pretest) to 80.64 (posttest), and the paired sample test significance was 0.000, which is less than 0.05.\"},{\"question\":\"Why is vocabulary important for language learning according to the introduction?\",\"answer\":\"Vocabulary supports speaking, listening, reading, and writing by helping learners express ideas, understand texts, and comprehend others’ speech.\"}]","The Implementation of Hello English Smartphone Application in Enhancing Students’ Vocabulary Mastery | PDF",1790617966,23]