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.
1. Testing Requirement
a Normality Test
Normality test is done on two classes; those are experimental class and control class. Normality test is used to know whether the data
from both sample groups which is examined comes from the population of normal distribution or not.
9
The writer uses SPSS v.18 for Windows to do normality test which is Analyze-Descriptive
Statistic-Explore-Plots-Normality Plots with Tests, the steps as follows:
10
1 From the menu at the top of the screen click on Analyze then
Descriptive then Explore.
2
Move all of the data into the Dependent list
3
Under Display ensure that there is only a tick next to Plots.
4
Click on the Plots tab to open the plots dialogue box.
5 Under Boxplots click None, and remove any ticks under
Descriptive. Place a tick in Normality plots with tests. Under
Spread vs. Level tick none.
6
Click Continue, and then OK.
b Homogeneity Test
After normality test gives indication that data is distributed normally, so it needs to do homogeneity test. It is used to know the
similarity of the two conditions or population. If the significant value ρ 0.05, it means that the population has similarity.
11
The writer uses SPSS v.18 for Windows to do homogeneity test which is Analyze-
Compare Means- One Way ANOVA- Option- Homogeneity of Variance, the steps as follows:
9
Budi Susetyo, Statistika Untuk Analisis Data Penelitian, Bandung: PT Refika Aditama, 2010, p. 271.
10
Andrew Garth, Analysis Data Using SPSS A practical guide for those unfortunate enough to have to actually do it, USA: Sheffield Hallam University, 2008, p. 73
11
Budi Susetyo, op.cit., p. 298.
