21. 24
79 55
22. 40
76 36
23. 64
88 24
24. 44
78 34
25. 44
80 36
26. 65
88 23
27. 72
88 16
28. 45
71 26
29. 57
80 23
30. 67
82 15
31. 58
82 24
32. 66
80 14
33. 54
85 31
34. 34
84 50
35. 24
76 52
36. 54
80 26
37. 24
70 46
n=37
According to the result of pretest and posttest from the experimental class, it shows the average of pretest is 51.89 and posttest is 80.45. The average of posttest
from the students who got treatment using entertaining Power Point is higher than the students from controlled class. The lowest score of posttest is 66 and the highest
score is 94. In this class, students who did not pass the minimal score are four students.
B. Analysis of Pretest and Posttest
Before calculating the value of t-test to look at the difference of significant level, it is necessary to find out the value of normality and homogeneity of the data.
The examination of normality is needed to know whether the data has been normally distributed. Then, after getting the normality, the next step is calculating the
homogeneity of data. It is proposed to look at whether the data is homogeneous or heterogeneous.
1. Normality Testing
The result of normality has been gotten by comparing the value of L
table
L
t
to L
observed
L
o
with the significance level α is 5. a. Data of Controlled Class
1 H
a
: Data has been distributed normally L
o
L
t
. H
o
: Data has not been distributed normally L
o
L
t
. 2 Because number of data is more than 30, the value of standard error is
gotten from L
t
= significance level, number of sample. L
t
see appendix 1 = 0.05, 37
3 L
o
see appendix 2 and 3
Table 4.3 Normality Testing of Pretest
S² = 67.175
L
o
= 0.096 L
t
= 0.145
Table 4.4 Normality Testing of Posttest
S² = 50.494
L
o
= 0.088 L
t
= 0.145
According to the Table 4.3 and 4.4, the value of L
o
of pretest and posttest are 0.096 and 0.088, so L
o
L
t
0.096 and 0.088 0.145. It means H
a
is accepted, so the normality testing of pretest and posttest for controlled class indicates that data are
distributed normally. b. Data of Experimental Class
1 H
a
: Data has been distributed normally L
o
L
t
. H
o
: Data has not been distributed normally L
o
L
t
. 2 Because number of data is more than 30, the value of standard error is
gotten from L
t
= significance level, number of sample. L
t
5 = 0.05, 37
3 L
o
see appendix 4 and 5
Table 4.5 Normality of Pretest
S² = 76.887
L
o
= 0.1084 L
t
= 0.145
