The effect of Extensive Reading (ER) on students' vocabulary mastery at Grade X SMAN 1 Batang Onang Padang Lawas Utara

Hasibuan, Wannurolan (2025) The effect of Extensive Reading (ER) on students' vocabulary mastery at Grade X SMAN 1 Batang Onang Padang Lawas Utara. Undergraduate thesis, UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan.

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Abstract

The purpose of this study is to determine whether the application of extensive reading has a significant effect on students’ vocabulary mastery. This study employs a quantitative approach with a pre-test and post-test design in experimental and control classes. The population of this study consists of all Grade X students of SMAN 1 Batang Onang, with a sample of 51 students divided into an experimental group (X MIA-1, n = 26) and a control group (X MIA-2, n = 25). Data were collected using vocabulary tests administered before and after the application of extensive reading. Data were analyzed using a t-test with the help of SPSS version 26.The results showed that the average score of the experimental group was higher than that of the control group. The average score of the experimental group after the implementation of extensive reading was 77.00, while that of the control group was 55.00. Additionally, the t-value obtained (t-count = 8.865) was greater than the t-table value (2.060), indicating that the alternative hypothesis (Hₐ) is accepted and the null hypothesis (H₀) is rejected. Thus, it can be concluded that the use of extensive reading significantly affects students' vocabulary mastery in Grade X at SMAN 1 Batang Onang, North Padang Lawas.

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