Table 8 Homogeneity Test
Class The
biggest variant
The smallest
variant F
observed
F
critical
Conclusion
Experimental 31.276
27.35 1.143
1.61 Homogeneous
Control
52.223 37.184
1.40 1.56
Homogeneous
Based on the table above, it can be seen that the result of the test in experimental class and the control class, the F
observed
are 1.143 and 1.40 while the F
critical
at the significant level of 0.05
.
It proves that H
o
is accepted because F
observed
F
critical.
It
means that the variance of the data is homogenous. see appendix 24
4. Result of Hypothetical Test
The researcher used the following t-test formula:
Y X
Y X
y x
N N
N N
y x
t
M M
1 1
2
2 2
Notes: Mx
= Mean of control class My
= Mean of experimental class ∑x²
= Average of deviation of control class ∑y²
= Average deviation of experimental class N
= Number of subject
1
The hypotheses formula is:
1
Arikunto, Op. Cit., pp 306-308
Ho : There is no a significant influence of using concept mapping towards students
descriptive paragraph writing ability at the first semester of the tenth grade of SMAN 2 Liwa in the academic year of 20162017.
Ha : There is a significant influence of using concept mapping towards students
descriptive paragraph writing ability at the first semester of the tenth grade at SMAN 2 Liwa in the academic year of 20162017.
Testing criteria: Ho is accepted if t observed t critical
Ha is accepted if t observed t critical
Based on the result see appendix 26 obtain t
observed
= 3.5 t
critical
at degree of significance 0.05 and d.f = N
X
+ N
y
– 2= 30 + 32 – 2 = 60 gain t
critical
= 1.67. Since 3.5 1.67, Ho is refused and Ha is accepted. It means that the treatment has
influence of the students’ score. It means that there is significant influence of using concept mapping towards students descriptive paragraph writing ability at the first
semester of the tenth grade at SMAN 2 Liwa in the academic year of 20162017.
C. Discussion
At the beginning of the research, the pre-test was conducted on October, 10
th
, 2016 at 07.15 A.M for class XI as the experimental class and X3 as the control
class at 08.45 A.M. the pre-test was administered to know students’ achievement in descriptive paragraph before they were given treatment by writer. The mean
score of pre- test Experimental class was 64.50 and the mean score of pre-test in control class was 55.30 the normality test and homogenity test showed that the
data of pre-test were normal and homogeneous. In the first treatment of Tuesday, October 11
th
, 2016 in X1, the writer told to the
students about the material and the focus of the study. The writer explained about writing aspects and rhetorical structure descriptive paragraph included generic
structure and grammatical features of descriptive paragraph. After the students understanding about descriptive paragraph, the writer introduced concept mapping
as a technique to teach writing especially descrptive paragraph. At second treatment on Tuesday, October 18th, 2016 in XI, the writer told to the
students about the material and the focus of the study. The writer taught the descriptive paragraph by using concept mapping.
At the last treatment, the writer told to the students about the material and the focus of the study. The writer taught the descriptive paragraph by using concept
mapping.
