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
1.
Pre-test
The pre-test for the students is carried out to get their score. The students are given a multiple choice test about vocabulary. This test does to know
students’ ability about vocabulary mastery. See Appendix 1
2. Post-test
The post-test is given in multiple choices also. This test is conducted to know the improvement of
students’ ability in vocabulary mastery after the writer gives treatment to students. See Appendix 3
3.
Interview
The interview consists of seven questions to be answered. This is conducted to strengthen the data through
knowing the students’ perception after the treatment. See Appendix 6
F. The Technique of Data Analysis
Test is used by the writer in collecting the data. The data from the test is gained to find out the result of students’ vocabulary mastery by using English
song from YouTube which is applied in the experimental class, then without English song from YouTube in the control class. It is obtained from VII 3 as an
experimental class and VII 2 as a controlled class of Islamic Junior High School RUHAMA. In this study, the writer uses T-test to find out the differences between
students’ score which are taken from pre-test and post-test in experimental class and control class. Before calculating the T-test, the writer first measures normality
and homogeneity test. Moreover, the writer uses SPSS v.18 for Windows software to analyze normality test and homogeneity test. In addition, the writer also uses
the simple random sampling in conducting the interview to the students.
