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CHAPTER III RESEARCH METHODOLOGY
This chapter presents the research design, the place and time of the study, the population and sample, the research instrument, the technique of data collecting, the
technique of data analysis, and statistic hypothesis.
A. Place and Time of The Research
The research was held at the eighth grade students of 166 Junior High School which located at Jl. Kedondong, Jagakarsa, on 20 of June 2016 until 17
th
of Januari 2017.
B. Method of The Research
This research employed quantitative method, which used quasi- experimental study as the research design. The quasi-experimental design is
described in the following table
1
:
Table 3.1 Pre- and Post-test Design
Select Controled Group
Pre-test No Treatment
Post-test Select Experimental
Group Pre-test
Experimental Treatment
Post-test
Based on the table above, the writer took two classes, the experimental class and controlled class. The writer conducted the research for six meetings. In the first
meeting, the writer gave pre-test to both of classes. Then the writer taught the
1
John W. Creswell, Education Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research, Third Edition, New Jersey: Pearson Education, Inc, 2008, p.310.
students in experimental class by using suggestopedia method and in controlled class without using suggestopedia method. After four meetings, the writer gave the post-
test to the both classes. It was given to know the effectiveness of Suggestopedia method on students’ vocabulary understanding.
C. Population and Sample
Creswell said that population is a group of individuals who have the selection
of individuals from a sample.
2
It means that population is
the set of entities under study.
In this research, the population is the whole students of the eighth grade at 166 Junior High School which consist of 245 students, that are divided into seven classes
namely class VIII 1, VIII 2, VIII 3, VIII 4, VIII 5, VIII 6 and VIII 7. For the research, the writer determined the sample by using purposive
sampling. Purposive sampling should be representative the whole population, based on the teach
er’s judgment and the sample should have same background.
3
The writer chose this sampling because of the basis of the teacher
’s judgment and the sample has been chosen for specific purposes, in this case, the purpose was the students with
average level of English vocabulary knowledge.
4
Therefore, the writer takes two classes namely class VIII 6 30 students as the controlled class and class VIII 7 30
students as the experimental class.
D. Data Collection Technique
In this research, the writer used Test as the data collection. Test was used to know the achievement of students’ vocabulary mastery before and after the treatment.
First, the writer gave pre-test to both class which was VIII 6 and VIII 7 on 14
th
and 16
th
of November 2016. The pre- test was to measure students’ achievement in
2
Ibid., p. 141
3
Frankael, Jack R, How to Design and Evaluate Research in Education, New York: The Mac Grow-Hill Companies, 2012, p.100
4
Louis Cohen, Lawrence Manion and Keith Morrison, Research Method in Education, Sixth edition, New York: Madison Avenue, 2007, p. 114
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