The Integration of Vocabulary and Effective Sentence Mastery Towards Students' Argumentative Writing Skills

The aims of this result to reveal the integrated of vocabulary and effective sentence mastery against the argumentation writing skill students' PBI-SU FITK UIN the hypothesis proposed in this results are : (1) vocabulary mastery contribute to the argument to the arguments writing skill of students; (2) effective sentence mastery contribute to the argument writing skill of student; (3) vocabulary mastery and effective sentence mastery together contribute to the argument writing skill of students. This result uses a quantitative approach. The population in this study is PBI UIN-SU as many as 6 classes. As for the samples in this result are students of class II. By using cluster random sampling, obtained a sample of 140 students. The instrument used is a test. These results indicate that: (1) vocabulary mastery contributed positively and significantly to the argument essay writing skills of students. The amount of contribution is 18.4%; (2) Effective sentence mastery contribute positively and significantly to the argument essay writing skills of students. The amount of contribution is 11.7%; (3) mastery of vocabulary and mastery of effective sentences together contributed positively and significantly to the argument essay writing skills of students. The major contribution is 26.5%; (4) mastering vocabulary to effectively contribute by 16.39% against the argument essay writing skills of students; (5) Mastery effective sentence effectively contribute 13.11% against the argument essay writing skills of students. Based on the results of this study, it was concluded that the vocabulary and mastery of effective sentences are the two factors that influence the argument essay writing skills of students in addition to other factors. Therefore, the researchers suggest to all parties concerned to pay more attention to these two factors so that students' skills in essay writing can be further improved.


INTRODUCTION
One person's language skills acquired through the study of English in a campus environment where education takes place, can be characterized by their skills to communicate. Therefore, learning vocabulary and writing should be implemented in to make students skilled language, both oral and written. For that, a student must know that the language consists of grammatical units, namely discourse, sentence, clause, phrase, word, and morpheme.
English Department which is a favorite department in the Faculty of Education and Teaching (FITK) State Islamic University of North Sumatra (UIN-SU). From the results it is observed that the teaching of English is still far from expectations. Not achieving the goal of teaching of English is often perceived by students and the public. Today in our society increasingly audible voices that expressed less satisfied with the results of English teaching.
The phenomenon in teaching of English to hinder the achievement of English teaching came from students, teachers, learning materials, and the implementation of the teaching and learning process.
Actually, the development of writing skills in general has started an advanced course. Thus, students should already have the skills to write well. But in reality, from the observation that researchers do at PBI FITK UIN-SU, can be delivered several observations: 1) unskilled students making up for his mastery of grammatical still weak and vocabulary inadequate, 2) lack of mastery in choosing words and phrases ,3) the use of the sentence and paragraph development in writing is not correct, 4) spelling and punctuation used in the writing not in accordance with the rules, 5) interest in reading books related to the English is still low, and 6) the rarely done exercises and another wrote habituation.
Problems of teaching English that comes from teachers are the shortage of teachers in implementing the learning process, namely: 1) lack of ability of teachers to select and use learning strategies teaching, 2) lack of ability of teachers implement the curriculum in teaching and learning, 3) lack of control of the teachers the subject matter, 4) the teachers who teach in English instead of English education background, and 5) lack of ability of teachers to evaluate student results.
In order to have good writing skills, students are required to have a lot of vocabulary, master standard English spelling, and know how to use of sentences, clauses, and phrases. In concrete terms this research problem can be identified as a lack of mastery in choosing words and expressions, the use of incorrect sentence and paragraph development in writing, inappropriate spelling and punctuation used in writing which is not in accordance with the rules, low interest in reading the books related to the English, and it is rare to do exercises and make a writing habit.
A primary issue in this research can be formulated with how great is the contribution made by the vocabulary and the contributions made by the mastery of effective sentences against the argumentative essay writing skills of students of PBI FITK UIN-SU. Simultaneously, this research aims to reveal the magnitude of the vocabulary and effective sentence mastery contribution to the argumentative essay writing skills of students FITK UIN PBI-SU. As research benefits expected to be useful for improving the quality of education and the teaching of English in particular about the vocabulary, sentences, and write the essay, the author can add insight and improve knowledge both theoretically and practically.

Theoretical Review
Stork (1976: 250) said that the vocabulary was the stock of words which were at the disposal of a speaker or writer. The terms refer to my vocabulary all words and phrases were used such as a particular variety-dialect-register, or terminology: a vocabulary word of inventory owned by the writer or speaker. That term refers to whole words, phrases were used in specific variations such as: dialects, registers, or in general terms.
In an effort to increase the quantity and quality of student vocabulary are actually all of these techniques can be used. However, in order that the technique could be used in accordance with the matter to be assessed, it should be selected in advance whether it is appropriate techniques are used or not.

Effective Sentence
The sentence is the main element of a discourse (Ambo Enre, 1988: 75). It is true to say that we must first learn to recognize words before the start stringing a sentence, but the sentence stating that we want to express meaning. The meaning is not the same as the number of words that make sense. Mc Wharter (1980: 57) explained that the sentence as a set of words express the unity of thoughts or ideas. A minimum number of sentence consisted of a subject and an activity associated with the subject which he called a predicate. Simultaneously elements of subject and predicate form the core parts are the core element of a sentence that carries significance (Keraf, 1990: 35), (Keraf, 1990:35 & Oshima, 1991. Similarly, Sugono (1998: 89) stated that a sentence should meet the requirements of grammatical construction. That means that the sentence should be arranged based on the correct rules which include: (a) the elements in a sentence, (b) the application of the correct spelling, and (c) selecting the right words in a sentence.

Argumentative Essay Writing
Writing as one of the components of language skills, requiring the expertise of a person in using a form of written language for communication purposes (Keraf, 1990: 42). Furthermore, Halim et al. (1974: 35) added that writing skills are the skills to organize and express the elements as follows: (1) the content of the article, (2) the form of essays, (3) grammar, (4) style or choice of structure and vocabulary, and ( 5) the application of spelling and punctuation.

METHODS & DISCUSSION
The following is the description of histogram distribution of variable frequency vocabulary such as,

Figure 1: Frequency Distribution Histogram Values Vocabulary Mastery
From the calculation done to be obtained 24.3% (34 students) including a group of high, 59.3% (83 students) including a group of moderate, and 16.4% (23 students) belong to a group that received a low score.

Figure 2: Frequency Distribution Histogram Sentence Mastery Value Effective
From the results of calculations carried a picture that 23.6% (33 students) belong to a group that earns high marks, 55.0% (77 students) including a group of moderate, and 21.4% (30 students), including low groups , Data

Figure 3: Histogram Frequency Distribution of Skills
From the results of the calculations have been made to know that 15.0% (21 students) including a group of high, 64.3% (90 students) including a mediocre group and 20.7% (29 students) included in the low group. These data show that students in essay writing skills of argumentation in general are in the moderate group. Furthermore, based on the level of understanding that is obtained from the average value with a maximum value is obtained tendency essay writing skills of argumentation Indonesian students were in enough categories, namely 79.39%.

Curve
Estimation Simple Regression Line Equations Variable X1 with Y

Figure 4: Distribution of Variable Data Mastery vocabulary
The picture above may explain the paradigm of the formation of the relationship variables mastery of vocabulary by using the arguments writing skill that are in the reception area which is linear and only one point that is outside the linear region (data extreme) which is used as a point prediction in order to establish the contribution vocabulary mastery of the skills wrote an essay arguing. Contributions

Figure 5: Distribution of Variable Data X2 and Y
From the above it can be concluded that the effective sentence has a positive and significant relationship with determination coefficient of 0.137. This means that the argument essay writing skills of students 13,7 %% determined by the mastery of effective sentences and the balance of 86.3% is determined by other factors.

The Contributions of Vocabulary and Effective Sentence Mastery towards Argumentative Essay Writing Skills
From this regression equation can be concluded that the vocabulary and mastery of effective sentences together against the argument essay writing skills of the student has a significant relationship. The coefficient of determination obtained at 0.275 indicates that the argument essay writing skills of students is determined by the vocabulary and mastery of their effective sentence against the argument essay writing skills by 27.5%, and the remaining 72.5% is influenced by other factors.

Effective & Relative Contributions to the Variable Bound Variables
Effective and relative contribution of each independent variable on the dependent variable. Although the terms of the empirical seen that the vocabulary and mastery of effective sentence of students to skills of arguments essay writing skill make a meaningful contribution, but due to the nature test in capturing vocabulary, effective sentence mastery and essay form provided with materials and topics are limited, so the vocabulary and arguments mastery of effective sentences and essay writing skills of students of PBI UIN-SU still need to be improved.
The independent variables are measured with test vocabulary and mastery of effective sentences students. The instrument of this research is in the form of a test. Problem for vocabulary tests of 60 questions (in the form of matching words as much as 30 multiplechoice questions and 30 questions), while the question to test the mastery of effective sentence in the form of multiple-choice questions numbered 40. As for student essay writing skills test, asked for an essay based on the title that has been provided.
The trials are valid and reliable instrument in accordance with procedures implementation, such as: (1) the determination of sample testing, (2) the implementation of the trial, (3) analysis of the trial, and (4) the results of testing the validity and reliability of the instrument.
While the data analysis technique using simple regression techniques and multiple regression and partial correlation techniques. The Tools for analyzing the data also using SPSS version 11.0 for Windows.
Dealing with the relationship among these three variables can be seen in the following diagram:

CONCLUSIONS
The conclusion of the result can be expressed as follows: 1. Vocabulary mastery (X1) has a positive and significant contribution to the argument essay writing skills (Y). This shows that the vocabulary (X1) consistently contribute directly to the arguments essay writing mastery (Y). Therefore, if the level of student mastery of vocabulary is good, the better the argumeQW HVVD\ ZULWLQJ VNLOOV RI VWXGHQWV ¶ ),7. 8,1 3%,-SU 2. The Mastery of effective sentence (X2) has a positive and significant contribution to the argument essay writing skills (Y). This shows that the mastery of effective sentences (X2) consistently also contribute directly to the student's argument essay writing skills (Y). Therefore, the better the level of student mastery of effective sentences, the better the DUJXPHQW HVVD\ ZULWLQJ VNLOOV PDVWHU\ VWXGHQWV ¶ ),7. 8,1 3%,-SU 3. The Mastery of vocabulary (X1) and mastery of effective sentences (X2) together have a positive and significant contribution to the student's argument essay writing skills (Y). This shows that the vocabulary (X1) and mastery of effective sentences (X2) consistently X 1 X 2 Y contribute directly to the argument essay writing skills (Y). Therefore, the better the student mastery of vocabulary and sentence effectively, the better the skill level of argumentation essay writing student FITK UIN PBI-SU.