b. Pre Test and Post Test
The next steps were pre test and post test. The pre test was administered before teaching and learning process to both of classes
– experiment class and controlled class
‒ to know that the students have relatively the same competence in English vocabulary in both
experiment class and controlled class, and the post-test was administered after finishing the teaching and learning process.
Next, the writer made categories from scores with rank value below:
≤ 50 : Weak
51-60 : Enough
61-70 : Good
71-80 : Very good
81-90 : Excellent
7. The Technique of Data Analysis
To analyze the data the writer used t-test. The writer compared the scores between the experiment class and the control class. This technique
is useful to know whether there is a significant different between two variables.
The formula of t-test which was used in this research is: M
1
– M
2
SE
M1 – M2
M 1 : Mean of the Difference of Experiment class
M 2 : Mean of the Difference of Control class
SE
M 1
: Standard Error of experiment class SE
M2
: Standard Error of Control class
t
o
=
The procedures of calculation were as follows: a.
Determining Mean of Variable X, the formula is: M
1 =
∑ X N
1
b. Determining Mean of Variable Y, the formula is:
M
2 =
∑ X N
2
c.
Determining Standard of Deviation Score of Variable X, the formula is:
SD
1
= X
2
N
1
d. Determining Standard of Deviation Score of Variable Y, the
formula is: SD
2
=
Y
2
N
2
e. Determining Standard Error of Mean of Variable X, the formula is:
SE
M1
=
SD
1
N
1
−1
f. Determining Standard Error of Mean of Variable Y, the formula is:
SE
M2
=
SD
2
N
2
−1
g. Determining Standard Error of Difference Mean of Variable X and
Variable Y, with formula:
SE
MI-M2
= ��
�1 2
+ ��
�2 2
h. Determining t
o
with formula:
t
o
= M
1
−M
2
SE
M 1 −M 2
i. Determining t-table in significance level 5 and 1 with Degree
of freedom df: df = N1+N2
‒ 2 Variable X: teaching vocabulary with The Jakarta Post newspaper articles
Variable Y: teaching vocabulary with textbooks
8. The Procedure of the Research
Before doing the experiment, the writer observed the location and population were carried out. The research was done in two different
classes, namely experiment class and controlled class. The writer employed The Jakarta Post newspaper articles in an experiment class and
textbooks in controlled class. This research was started with the same type pre-test and then
followed by the teaching – learning activities for four meetings which are
conducted in each class. Afterward the same type post-test was administered to both experiment class and control class. For more detailed
activities in teaching learning process, look at the appendices RPP, p. 45. Then the writer, made a calculation of the result from both of tests.
The further explanation will be discussed in the research findings.
9. The Analysis of The Data
Kategori