No. Students’
Number Pre – test
Y
1
Post – test Y
2
Gained Score Y
Y
2
20. 20
69 43
-26 676
21. 21
56 51
-5 25
22. 22
40 54
14 196
23. 23
52 45
-7 49
24 24
42 73
31 961
25. 25
56 56
26. 26
45 45
27. 27
70 73
3 9
28. 28
42 54
12 144
29. 29
60 56
-4 16
N
2
= 29 ∑ Y
1
= 1491 ∑ Y
2
= 1598 ∑ Y= 107
∑ Y
2
= 3245 ∑ N
2
= The total students in the controlled class ∑ Y
1
= The total pre-test score of students in the controlled class ∑ Y
2
= The total post-test score of students in the controlled class ∑ Y = The total gained score of students in the controlled class
∑ Y
2
= The square of the total gained score of students in the controlled class Based on the table, the result is ∑ Y
1
=1491 , ∑ Y
2
=1598 , ∑ Y=107 , and ∑ Y
2
=3245 . The result will be used to find out the t-test. Here are the steps: 1. Determining mean of gained score of experimental class
M
= = 20.2
2. Determining mean of gained score of controlled class
= = 3.7
3. Determining of deviation of experimental class
= 16263 – = 16263 –
= 16263 – 11881.6 = 4381.4
4. Determining of deviation of controlled class
= 3245 - = 3245 –
= 3245 – 394.8 = 2850.2
5. Determining the t-test After gaining the main gained score and the deviation from each
class, the next step of calculation is determining of the t-test, the formula from Arikunto’s bookis used as follow
2
:
2
Suharsimi Arikunto, Prosedur Penelitian Suatu Pendekatan Praktik, Jakarta: PT. Rineka Cipta,2006,p.312.
. .
.
. .
. .
. .
.
5.10 Based on the calculation above, it is showed that the result of the t-
test from the experimental and the controlled class is 5,10 6. Determining the t-table t
t
in significance level α 0,05 by calculating degrees of freedom df.
df = N
x
+N
y
– 2 = 29 + 29 -2
= 58 - 2 = 56
The degrees of freedom df = 56 7. To check the criteria t-table with significance degree 5
The t-table of degrees of freedom 56 in significance level α 0.05 is 1.67. Comparing t-observation t
o
= 5.10 and t-table t
t
= 1.67 , it is known that t
o
is higher than t
t
. The result is as follows :
5.101.67
C. The Test of Hypothesis
After calculating the data, the hypothesis also tested based on the statistical hypothesis previously stated. The statistic hypothesis used in this research is:
The calculation shows that the = 5.10 is higher than
= 1.67, it means that the alternative hypothesis is accepted. The alternative hypothesis in this
research is there is an influence of using mind mapping in writing essay.
D. The Interpretation of the Data
Based on the formula above, the result shows that the value of t
o
is higher than t-table or
. The value of
is 5.10 and the value of is 1.67.
It shows the difference between students’ score of each group the experiment and controlled group. It means that the alternative hypothesis is accepted and the
null hypothesis is rejected. It was indicated that the notion about there is a significant difference between experimental and controlled group is accepted. In
other words, using mind mapping is effective in the teaching of writing essay.
CHAPTER V CONCLUSION AND SUGGESTION
This chapter presents the conclusion of this quasi-experimental research based on the research finding described in the previous chapter. It also presents the
answer of the research problem stated in the first chapter. The suggestion is also offered for those who interested in writing essay using mind mapping.
A. CONCLUSION
Using mind map in writing essay is effective. It can be seen from the research finding stated by statistical data. From the result, it can be seen that the
hypothesis is tested using t-test formula based on Arikunto’s book and the result is rejecting null hypothesis
. The null hypothesis in this research is ‘there is not an influence of using mind mapping in writing essay’. In other words, the
result proved the alternative hypothesis in this research stated that ‘there is an influence of using mind mapping in writing essay”. The result of statistical
hypothesis test shows that and
or . It was
indicated that the null hypothesis is rejected and alternative hypothesis is accepted. Therefore, the research is concluded that this quasi-experimental
research has proved the notion that the using of mind mapping is effective in the teaching of writing essay.
B. SUGGESTION
The suggestions that the research would like to give based on the conclusion above are as follows:
1. For the teacher: a. After applied the technique of mind mapping in teaching students of
writing essay, the researcher would like to suggest the English teacher especially who taught writing to use the technique of mind mapping in
teaching writing in order to make the students easily understand the material.
b. The technique of mind mapping is easy to use. Therefore, it also will helpful enough for the teacher who interest in applying mind mapping
as an alternative method in teaching and learning process. c. Not only for the use of mind mapping in writing essay, the teacher also
could applied the technique in writing any kinds of text, especially for English language subject.
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Department, Faculty Tarbiyah and Teachers Training, UIN Syarif Hidayatullah Jakarta, Jakarta, 2012.
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