B. The Place and Time of the Study
The research is held at the seventh grade students of Islamic Junior High School RUHAMA which is located at South Tangerang, from January 5
th
until 30
th
, 2015
C. The Population and Sample
Population is the universe of people to which the study could be generalized, and a sample is the subset of people from the population who will
participate in the current study.
3
In this research, the population is the whole students of the seventh grade at Islamic Junior High School RUHAMA, they are
96 students that are divided into three classes namely class VII 1, VII 2, and VII 3. For the research, the writer determines the sample by using purposive sampling;
the sample is taken on the basis of their judgment of their typicality or possession of the particular characteristics being sought.
4
Here, the writer takes the sample based on teacher’s judgment that she judged. The two classes that the writer takes
had almost same average value. Therefore, the writer takes two classes namely class VII 2 30 students as the control class and class VII 3 30 students as the
experimental class, this is because according to the English teacher ’s view in the
school; those classes are appropriate to be the object of this research.
D. The Research Instrument
The writer uses pre-test and post-test as the research instruments to collect the data. The test is used in order to know the different achievement between the
experimental class and control class after the treatment. Before the test is given to the students, the writer has already measured the validity and reliability of the test.
Validity is “the individual’s scores from an instrument make sense are meaningful, and enable you, as the writer, to draw good conclusions from the
3
Scott W. Vanderstoep and Deirde D. Johnston, Research Methods for Everyday Life, San Fransisco: Jossey-bass, A Wiley Imprint, 2009, p. 26.
4
Louis Cohen, Lawrence Manion and Keith Morrison, Research Method in Education, Sixth edition, New York: Madison Avenue, 2007, p. 114
sample you are studying.”
5
Validation in language testing is needed to ensure the defensibility and fairness of interpretations based on test performance.
According to Jones, “reliability in testing denotes dependability, in the sense that a reliable test can be depended on to produce very similar results in
repeated uses.”
6
In this research, the writer measures the validity and reliability of the research instrument by using ANATES V.4. For the ANATES result, it can be
seen on the appendices. The secondary data is gotten
from students’ interview. Interview allows a wider channel of communication and deeper exploration of issues.
7
It is conducted to strengthen the data which are gotten from the test,
to know the students’ perception about English songs from YouTube, and to make sure whether the
techniques is successful to prove studen ts’ vocabulary mastery which is applied in
experimental class or not. The interview is done to the 10 students. In this case, the writer uses simple random
sampling technique to get data from students’ interview.
“Simple random sampling involves picking a certain number of
participants out of the total number of possible participants in the sampling frame. In simple random sampling, a fixed percentage of the total sampling frame is
selected for participation. ”
8
E. The Technique of Data Collecting
In this research, the writer uses test to collect the data. The test is used in order to know the effectiveness of English songs from YouTube
toward students’ vocabulary mastery at seventh grade students of Islamic Junior High School
RUHAMA. The test technique is the main technique in collecting the data. The pre-test and post-test will be given to both experimental class and controlled class
to find out their achievement in vocabulary mastery.
5
John W. Creswell, op.cit., p 169
6
Cyril J. Weir, Language Testing and Validation, New York: Palgrave MacMillan, 2005, p. 22.
7
Vanderstoep and Deirde., Op.cit., p. 88
8
Vanderstoep and Deirde., Ibid., p. 29
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