Table 3.1 The Validity of the Instrument
Standar Kompetensi
Kompetensi Dasar
Skill Indikator
Nomor soal Berkomuni
kasi dengan bahasa
Inggris setara level
elementary Merinci tugas
pekerjaan dan latar
belakang pendidikan
yang dimilikinya
secara lisan dan tulisan
Writing
speaking Siswa
mampu membuat
kalimat simple
past tense dan
mengung kapkann
ya dengan
tepat untuk
meneran gkan
latar belakang
pendidik an
berbagai macam
profesi 6. Dony .... his study at
Harvard University
last year, and now he becomes a
manager in an advertising company.
a. Finish b. Finished
c. Had finished d. Finishes
e. finishing
This table is taken from the English syllabus for the second grade of Vocational School
In addition, for measuring the reliability of the research instrument, the writer used SPSS Statistic Product and Statistic Solution. The writer finds the
reliability of 30 it ems in the test is α = .862 which means that the reliability of the
research instrument is high.
F. Technique of Data Analysis
After getting the pre-test and the post-test score as the data of the research, the writer then analyzed it by using statistic calculation of t-test formula both
manually and using software calculation that is SPSS statistic Product and Statistic Solution.
The t-test was calculated for three times. The first was t-test of the pre-test scores, in which the writer compared the pre-test scores of the experiment class
and the controlled class. The t-test of pre-test was aimed to know the background of knowledge of the experimental class and the controlled class before the
treatment given. The second t-test was t-test of post-test scores, in which the writer compared the scores of the post-test of the experimental class and the
controlled class. The purpose of the t-test of post test was to know whether there was significant difference of the post-test scores between the experimental class
and the controlled class. The last t-test was the t-test of gained score. The writer compared the gained score in the experimental class and the controlled class in
order to know whether their improvement is different. The t-test of gained score was purposed to know whether there was any significant difference between the
experimental class and the controlled class. It also answered whether the alternative hypothesis H
a
was accepted or rejected. Here are the manual formulas to count the t-test:
4
t
o
=
MY MX
Y X
SE M
M
________________________
4
Anas Sudijono, Pengantar Statistik Pendidikan, Jakarta: PT. Raja Grafindo Persada, 2006, p. 314.
M
x
: Mean of the Difference of Experiment Class M
y
: Mean of the Difference of Controlled Class SE
MX
: Standard Error of Experiment Class SM
MY
: Standard Error of Controlled Class X
: Teaching Simple Past Tense with CTL in Experiment Class
Y : Teaching Simple Past Tense with conventional method
in Control Class. The procedures of calculation were as follow :
a. determining Mean of Variable X, the formulation is :
M
x
=
1 N
X
b. Determining Mean of Variable Y, the formulation is :
M
y
=
2
N Y
c. Determining Standard of Deviation Score of Variable X, the formulation
is: SD
x
=
1 2
N x
d. Determining Standard of Deviation Score of Variable Y, the formulation
is: SD
y
=
2 2
N y
e. Determining Standard Error of Mean of Variable X, the formulation is :
SE
MX
= 1
1
N
SD
X
f. Determining Standard of Error of Mean of Variable Y, the formulation is :
SE
MY
= 1
2
N
SD
Y
g. Determining Standard Error of Different Mean of Variable X and Variable
Y, with formulation : SEM
x
-M
y
=
2 2
MY MX
SE SE
