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Chart 4.7 Control Student’s Grade
From the chart above, the increment of students‟ grade in control group was
significant for “Good” criteria there was 1 student 3.3, for “fair” and “poor” criteria there were 3 10 and 26 86.7 students in pre test. While the
achievement in post test there were 12 studen ts 40 who got “Good” criteria, 17
students 56.7 got “Fair” and only 1 students 3.3 who got “Poor”
4.4 Difference Gain Between Pre – test and Post – test
The difference gain of writing news item text of the pre-test and post-test of experimental and control group as follows:
For experimental group
M
x
= =
5 10
15 20
25 30
Excellent Very
Good Good
Fair Poor
Very Poor
1 3
26
12 17
1
Pre-Test Post-Test
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Where: : sum of difference gain of pre-test and post-test of experiment
group. : the number of students of experimental group
The difference gain of pre-test and post-test of experimental group was 15.8.
For control group
M
y
= =
Where: : sum of difference gain of pre-test and post-test of control group.
: the number of students of control group The difference gain of pre-test and post-test of experimental group was 12.9.
4.5 Difference between Two Means
From the computation, the mean of experimental and control group can be seen in the following table:
Table 4.8 The Average Score of Pre-Test and Post-Test of Control and Experimental
Groups Pre-test
Post-Test Control Group
56.7 69.6
Experimental Group 56
72.7
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From the table above we can see the mean of the two group were not different from each other. However, the mean of the experimental group was higher than
the mean of the control group.
4.6 T-test Result
In order to see the difference between the gain of the pre-test and the post test of the experimental and control group, the writer used t-test:
t
After counting data using the formula above, the writer got the result of t-test was 2.207,
for α = 5 with the number of students n= 30 and t
table
= 1.67. Based on the computation, the writer found that t-value 2.207 was higher than critical
value on the table 1.67. It can be concluded that there was a significant difference between experimental group and control group.
4.7 Discussion of Research Finding
This study is aimed to describe the writing test achievement for the tenth grade students of SMA Negeri 1 Slawi in the academic year of 20102011, who taught
using old and new information and those who taught using jumbled sentences. Then, to investigate whether there is any significant difference in the writing test
achievement between them.
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The improvement of their writing could be seen in their pre-test and post- test result. The result of average pre-test of the experimental and control groups
were 56.8 and 56.7. From this result, it was found that the ability of both groups were relatively the same. Furthermore, based on their pre-test scores, we can see
that the students have some difficulties in writing news item text. They make some error especially in their idea. Their ideas not clearly stated and the sentences
in their text were not well-organized. It made their text was hardly to understand. After giving treatment, the students‟ ability in writing news item was
improved which was proved by the result of post-test. The post-test score for experimental group was 72.67; there was an upgrading point from the pre-test.
Meanwhile, the control group, those who taught using jumbled sentences, also gained their score into 69.60. Yet, based on the score, it can be seen that the score
of experimental group is higher than the control group. The section bellow shows the average of each aspect of both in pre-test and post-test.
Table 4.9 Average of Each Aspect both in Pre-Test and Post-Test
of Control Group Aspect
Pre-Test Post-Test
Average of Grammar 2.8
3.3 Average of Vocabulary
