3. Hypothesis Testing
Hypothesis testing is the last step to answer the formulation of this research. From the hypothesis testing, it will be found the result whether entertaining Power
Point media gives significant influence on students’ understanding of Passive Voice. a. H
a
: There is an influence of using Power Point media on students’ understanding of Passive Voice t
o
t
t
. H
o
: There is no influence of using Power Point media on students’ understanding of Passive Voice t
o
t
t
b. α = 5 c. t
t
see appendix 2 = 0.05, n1+n2-2 = 0.05, 72
= 2.00 d. Hypothesis testing is calculated by the formula, as follows:
in which: : mean score of controlled class
: mean score of experimental class : Standard Error of experimental and controlled class
SE : Standard Error
SD : Deviation Standard
n : number of students
e. The steps in calculating hypothesis testing 1 M
X
: 72.40 M
Y
: 80.45 2 SD
X
: 7.1 SD
Y
: 5.93
Calculating t
o
with the formula:
C. Data Interpretation
1. Quantitative Data
According to the result of numerical calculation, it explains that the mean of pretest from the controlled class is 49.78 and after doing posttest, the mean is 72.40.
The students of controlled class who pass the criterion KKM in posttest are 14. The rest of the students are below the minimum standard of English subject 75.
Based on the experimental class, the average of pretest is 51.89, and the value is not so different from the controlled class has. Then, the students of experimental
class got Power Point treatment in teaching and learning process while the controlled class did not. In fact, the mean of posttest has increased. The result of posttest shows
the value 80.45. The students who get mark under 75 are four students, and approximately 89 of the students pass the minimal criterion of success.
Before calculating the hypothesis testing, it is necessary to examine the normality and homogeneity of the data. Normality testing of controlled class shows
that L
o
pretest L
t
0.096 0.145 and L
o
posttest L
t
0.091 0.145. It means that
the data is normal. Normality testing explains that the distribution of students’ score of upper and lower group is regular. Then, homogeneity testing is conducted, and the
result shows that the condition of the students from two classes is homogenous because the value of F
o
F
t
. The last step is testing the hypothesis by using t-test statistic formula with the
significance level α 5. Hypothesis testing is conducted to get the quantitative research finding. Normality and homogeneity testing are aimed to look at the
condition of data and to decide the formula of testing, so it uses parametric test to examine t-test statistic.
According to the result of t-test, it shows that the value of t
o
is 5.23 while t
t
shows the value 2.00. In short, hypothesis testing indicates that t
o
is higher than t
t
. The condition in which t
o
t
t
shows that null hypothesis H
o
is rejected. It means alternative hypothesis, “there is an influence of using entertaining Power Point media
on students’ understanding of Passive Voice”, is truly proven. The result of t-test statistic shows the entertaining Power Point media gives significant influence on
enhancing students ‘understanding of Passive Voice.
2. Qualitative Data
The observation was conducted to know the condition in the classroom while teaching and learning process took place and to support the quantitative data. The
observation involved the researcher, teacher pamong, and students. The activity to observe the students in the classroom was done by the researcher who was also the
teacher in that class, while teacher pamong observed the researcher in teaching Passive Voice.
Based on the observation conducted in the experimental and controlled class, it showed that the students in the experimental class which functions Power Point in
their learning process learnt more active and effective than the students in controlled class did. The students where they were in the experimental class was attracted to
attend to the material given by the teacher. Moreover, students’ motivation in
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