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Picture 8 Histogram and Polygon the Writing Scores of the Students
Having Low Creativity Level
B. Testing Hypotheses
The two-way variance with the same cells is used to analyze the data gained from the post-test of writing given to both control and experimental classes.
However, before computing this analysis, there are some requirements needed as the prerequisite conditions. Budiyono 2004: 206 mentions that the two-way
variance with the same cells can be applied if the data gained come from populations whose distributions are normal and if the data obtained come from
populations, which are homogenous. The followings will be about the computations of normality and homogeneity tests applied to the gained data.
1. Normality Test
To know whether a population is normal or not, normality test is employed. In this research, the normality test was applied to the writing scores of
experimental and control classes in accordance with the creativity level. Then,
19.5 26.5
33.5 40.5
47.5 54.5
61.5
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Lilliefors
test was employed to find out the normality of teaching materials and creativity level. The tests results are presented in the following table, while the
complete computation for each can be found in Appendices 4.1 up to 4.8. Table 25
The Summary of Normality Test using
Lilliefors
No Variables
L
obs
Number
of Data
L
table
Test decision
Description
1 Writing Scores of the
Students Taught by Using Internet
Materials 0.145
24 0.173
H
o
was accepted
Normal
2 Writing Scores of the
Students Taught by Using Textbook
Materials 0.121
24 0.173
H
o
was accepted
Normal
3 Writing Scores the
Students Having High Creativity and Taught
by Using Internet Material
0.170 12
0.242 H
o
was accepted
Normal
4 Writing Scores the
Students Having High Creativity and Taught
by Using Textbook Material
0.129 12
0.242 H
o
was accepted
Normal
5 Writing Scores the
Students Having Low Creativity and Taught
by Using Internet Material
0.105 12
0.242 H
o
was accepted
Normal
6 Writing Scores the
Students Having Low Creativity and Taught
by Using Textbook Material
0.175 12
0.242 H
o
was accepted
Normal
7 Writing Scores of the
Students Having High Creativity
0.119 24
0.173 H
o
was accepted
Normal
8 Writing Scores of the
Students Having Low Creativity
0.099 24
0.173 H
o
was accepted
Normal
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The result summary of the normality using Lilliefors test shows that all of the values L
obs
gained are lower than L
table
. Therefore, it can be concluded that all of the populations based on both teaching materials and creativity levels were
normal. 2.
Homogeneity Test Bartlett test is employed to know whether all the variances of the research
are homogenous. The students’ writing scores were the dependent variables and the teaching materials and creativity levels were the factorial variables. While the
complete computation can be found in Appendix 3.19, the summary of the test of homogeneity is as follows:
Table 26 The Summary of Homogeneity Test of Variance
Variables b
obs
b
k
Test decision Description
Materials 0.9008 0.9182 H
o
was accepted Homogenous Based on the table, all the gained values for all b
obs
are lower than b
k
. Then, it can be summarized that all H
o
were accepted. As a consequence, the data gained from the results for both variables derived from homogenous populations.
C. Test of Hypotheses Using Two-way ANOVA with the Same Cells
Kategori