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Table 5. Increase from Pre test to Post test in Experimental Class
Score of Pre test Score of Post test
Increase Mean X
51.4 75.44
24.04
Having seen the result of the pre test and post test in experimental class, we can see the increase of the students‟ score. The increase of the students‟ content,
organization, vocabulary, grammar and mechanic can be presented as follows:
Table 6 . Increase of the Students’ Scores in Experimental Class
Aspect Pre test
Post test Increase
percentage Content
10.45 16.03
5.58 60 Organization
10.85 15.25
4.4 45 Vocabulary
10.3 14
3.7 35 Grammar
9.85 14.85
5 50 Mechanic
9.95 15.31
5.36 55
From the result above, it could be stated that model composition guided writing can increase each aspect of writing; content, organization, vocabulary, grammar,
and mechanic. The highest increase of score among five aspects of writing was content 5.58 and the lowest was vocabulary 3.7. It could be concluded that
model composition guided writing can increase students‟ descriptive text writing
ability especially in the aspect of content.
4.2 Random Test
The random test is conducted if the sample from the population that is taken
randomly is still doubtful. The sample should be tested again by using SPSS 15, descriptive statistic Runs Test. From the table in appendix 7, in all tests of both
experimental and control class, the writer concluded that the data were random.
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4.3 Normality Test
The normality test is used to measure whether the data in experimental class and
control class are normally distributed or not. In this case, the writer uses the SPSS 15, the one sample Kolmogorov-Smirnov formula to test the normality of the data.
From the tables in appendix 8, we can see that in all tests of both experimental class and control class, the writer concluded the data in both of classes were
normally distributed.
4.4 Homogeneity Test
Before administering the data in the post test, it was necessary to be certain that
the data were homogeneous or not. The writer used SPSS 15, independent sample test formula to know the homogeneity of the test. Based on the computation in
appendix 9, it can be seen that the variance of the data of both experimental and control class is homogeneous.
4.5 Hypothesis Test
There was one hypothesis in this research, it was model composition guided writing can increase students‟ descriptive text writing ability. In order to prove
whether the hypothesis is accepted or rejected the writer used one sample test formula to analyze the data.
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One-Sample Statistics
N Mean
Std. Deviation Std. Error
Mean PRETESTSCORE
22 54.5455
7.38549 1.57459
POSTTESTSCORE 22
78.4091 7.30074
1.55652
One-Sample Test
t df
Sig. 2- tailed
Mean Difference
95 Confidence Interval of the Difference
Lower Upper
Lower Upper
Lower Upper
PRETESTSCOR E
34.641 21
.000 54.54545
51.2709 57.8200
POSTTESTSCO RE
50.374 21
.000 78.40909
75.1721 81.6461
The table showed the result of the computation that t-value is 34.641 in pre-test score, 50.374 in post-test score and the two tail significance shows that p 0.05 p
= .000. Based on that analysis, p 0.05, so it could be concluded that model composition guided writing can increase students‟ descriptive text writing ability.
In other words, the hypothesis is accepted.
4.6 Control Class
