The independent variable is the use of language laboratory medium in teaching listening and the dependant variable also called posttest is the outcome of
the study. In applying the study, the writer holds tests. Which is before the research
students will have given the pre-test to know students’ level of English listening
performance. The post-test was given after the teaching learning process. These activities were done to make sure that the treatment has significant influences.
The approach in this study is quantitative. The data collected consists of student’s listening tests data, literature books, articles and internet sources.
C. Population and Sample
The population of this research is the whole students of SMA Islamiyah Sawangan which consist of six classes. The total population was 210 students
which are divided into two classes of class X.1 and class X.2, two classes of one class XI Science and class XI Social Science, two classes of class XII Science and
class XII Social Science. The writer took students from X.1 and X.2 classes as the sample for this research. X.1 consists of 30 students and X.2 consists of 31
students. However, in the end of the research, she only gets 29 students from each class because the rest of the samples were absent while in the pre-test and post-
test.
D. Instrument of Research
The research instrument that used for this study is a test given to the students. The tests consist of twenty-five questions in multiple choices, and five
questions in filling gaps, so there are all thirty items in number. The writer gave pre-test before teaching and learning process for both two classes and gave post-
test after the treatment given.
E. Technique of Data Collecting
In this research, the writer used pre-test and post-test to collect the data which were given to the experimental and control class. The pre-test was given
before the learning process of listening. The post –test was given after the learning
process in order to know the difference achievement between the experimental class and the control class.
The pre-test and the post-test are the same category of multiple choice items, and filling gap see appendices. The data or the listening test measures the
students understanding about expressions in listening materials from the syllabus.
F. Technique of Data Analysis
In analyzing the data, the writer used statistical calculating of t-test in order to find out the difference achievement of students score in teaching listening
with language laboratory compared with teaching listening without language laboratory.
The writer used comparative technique. This technique is useful to compare the score between experiment class and control class. In this technique,
there are several procedures which is consists of several steps. The procedure uses the t
test
formula to calculate the data. The t
test
is used to prove the hypothesis statistically about the outcome difference achievement of the two classses. They
were compared to recognize whether or not the differences are significant. In this case, the experimental class is X and the control class is Y variable.
The formula of the t
test
is expressed as follow
1
; T
o
= M
x
= Mean of variable X M
y
= Mean of variable Y
1
Anas Sudijono, Pengantar Statistik pendidikan, Jakarta: PT Raja Grafindo Persada, 2006, p. 314
—316.
SE = Standard Error
SD = Standard Deviation
Before doing the calculation of t
test
, there are several steps to be taken, the steps are:
a. Determining Mean of variable X =
∑
b. Determining Mean of variable Y =
∑
c. Determining standard of Deviation Score of Variable X =
√
∑
d. Determining Standard of Deviation of Variable Y =
√
∑
e. Determining Standard error Mean of Variable X =
√
f. Determining standard error mean of Variable Y =
√
g. Determining standard error of different mean of Variable X and Mean of Variable Y
= √
+ h. Determining
t observation =
i. Determining Degrees of freedom df =
+ – 2
Variable X: teaching listening through language laboratory Variable Y: teaching listening without language laboratory
G. Statistical Hypotheses
