Conclusion : In the significant degree of 0.05, H
o
is accepted. It means that the data is normally distributed.
2. Homogenity of the Data Based on the calculation of normality, the writer got the result that all data
in pre-test and post-test of both experiment class and controlled class have been distributed normaly. The next step of the calculation was finding the homogenity
of the data. The purpose of this calculation was to see whether the data sample in both classes was homogenous or heterogenous.
Hypothesis: H
o
: The condition of experiment class is not different from controlled class. H
1
: The sample of experiment class is different from controlled class. The criteria of the test:
α = 0.05 H
o
: F
αn1-1, n2-2
F F
αn1-1, n2-2
H1: F F
αn1-1, n2-2
The formula used can be seen as follows:
or
The calculation can be seen as follows:
n1-1 = 40-1 = 39 n2-1 = 40-1 = 39
F
0.05n1-1, n2-1
= 1.84 F
table
From the calculation, it can be seen that F F
αn1-1, n2-2
1.105 1.84 . Based on the criteria, it can be conclude that H
o
is accepted. It means that the sample in experiment class and controlled class were homogenous.
C. Hypothesis Testing
In this part, the writer calculated the data to test the hypothesis that whether there is significant different between students’ reading interest in
experiment class which given English teens magazine and students’ reading
interest in controlled class without English teens magazine. The writer calculated the data using T-test formula. Two classes were compared, the experiment class
was X variable and the controlled class was Y variable. The formula of T-test was expressed as follows:
The calculation can be seen as follows: 1. Determining Mean of variable X:
∑
2. Determining Mean of variable Y: ∑
3. Determining Standard of Deviation Score of Variable X:
√
∑
√ √
4. Determining Standard of Deviation Score of Variable Y: √
∑ √
√ 5. Determining Standard Error Mean of Variable X:
√ √
√
6. Determining Standard Error Mean of Variable Y: √
√ √
7. Determining Standard Error of different Mean of Variable X and Mean of Variable Y, with formula:
√ √
√ √
8. Determining t
o
with formula:
9. Determining Degrees of Freedom df, with formula:
The value of df 78 at the degrees of significance 5 or t
table
is 1.991. 10. The Testing of Hypothesis
The statistical hypothesis of this research can be seen as: Ho : There is no significant difference
between students’ reading interest by using English teens magazine and without English teens magazine
Ha : There is a significant difference between students’ reading interest by using
English teens magazine and without English teens magazine. And then, the criteria used as follows:
1. If t-test t
o
t-table t
t
in significant degree of 0.05, Ho null hypothesis is rejected.
2. If t-test t
o
t-table t
t
in significant degree of 0.05, Ho the null hypothesis is accepted.
