4.5 Analyzing the t-test
The test is intended to investigate whether there is any significant difference of skill in writing descriptive text between the students taught by using study tour
method and those who taught without using study tour method. It was hypothesized that the difference occurs.
To measure the significance of the pre-test and the post-test, the t-test was used. The t-value obtained from the computation should be consulted with the
critical value in the t-table. The result of the consultation was then used as an attempt to verify the hypothesis. The t-test formula was applied to measure the
significant difference between the experimental and control groups. The d
1
and d
2
were obtained from the differences in score between the pre-test and post-test of both groups.
The formula is as follows:
t
= 1
− 2
�12+ �22 1+ 2− 2
1+ 2 1
2
Before applying the t-test formula, the writer should find out M
1,
M
2,
�
1 2
and �
2 2
. From the appendix 25, it can be seen that M
1
was 3.31 and �
1 2
was 179.54 and from the
appendix 24, it can be seen that M
2
was 1.58 and �
2 2
was 142.35.
t
=
1 −
2 �12+ �22
1+ 2− 2 1+ 2
1 2
=
26
26 26
26 2
26 26
35 .
142 54
. 179
58 .
1 31
. 3
x
=
676 52
50 89
. 321
73 .
1
= 33800
28 .
16738 73
. 1
=
4942 .
73 .
1
=
1.73 0.7037
= 2.46 To interpret the t obtained, it should be consulted with the critical value of
the t-table to check the difference is significant or not. In education research, the 5 0.05 level of significance is used. If the t-value is higher than t-table, it
means that there is significant difference between the two means. Contrary, if the t-value is lower than t-table, it means that there is no significant difference
between the two means. The number of subjects in this study for the experimental and control groups
were 52 with the degree of freedom df = 50, that was from Nx + Ny – 2 = 50. At
the 5 0.05 alpha level of significance, t-value that was obtained was 2.46 and t-table was
2.18, so the t-value was higher than t-table. It means that there is
significant difference in achievement between the students who were taught
writing descriptive text by using study tour method and those who were taught without using study tour method.
In other words, the research findings reveal that the result of the treatments is in line wit
h the writer‘s hypothesis that ―the eight grade students of SMP Takhassus Al-
Qur‘an Wonosobo in the academic year 20102011 taught by study tour method gain significantly better mastery of writing skill of descriptive text
than students taught without stud y tour method.‖
Therefore, the null hypothesis that ―the eight grade students of SMP Takhassus Al-
Qur‘an Wonosobo in the academic year 20102011 taught by study tour method do not gain significantly better mastery of writing skill of descriptive
text than students taught without study tour method ‖ is rejected.
4.6 Discussion of the Research Findings
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