= –
= 4 835.5 – 69.16
2
= 4 835.5 – 4 783.10
= 52.4 Homogeneity Test of Pre-Test
F
value
= =
= 1.45
Table 4.10 The Result of Homogeneity Pre-Test of Experimental and Controlled Class
No Class
Variance N
F
value
F
table
Criteria 1.
Experimental 76.04
30 1.45
1.85 Homogenous
2. Controlled
52.40 30
The following is the writer ’s assumption:
Ho : the data of homogenous variance H
1
: the data of un homogenous variance The criteria is Ho accepted if F
value
1.85 and rejected if F
value
1.85 with α = 5.
Based on Table 4.6, F
value
is smaller than F
table
, with the closest critical value of 29 with degree of significance 0.05 which is F
value
F
table
1.45 1.85. It shows Null Hypothesis Ho is accepted and the data of pre-test group sample was taken
from homogeneous population.
4. Homogeneity Test of Post-Test
The homogeneity test was used to find out whether the group sample which was taken from population is homogeneous or not. The following is the calculation of
homogeneity test of post-test:
Variance of Post-Test of Experimental Class S
2
=
∑
-
∑
= –
= 6 538.03 – 80.63
2
= 6 538.03 – 6 501.19
= 36.84
Variance of Post-Test of Control Class S
2
=
∑
-
∑
= –
= 5 491.56 – 73.76
2
= 5 491.56 – 5 440.53
= 51.03
Homogeneity Test of Post-Test F
value
= =
= 1.38
Table 4.11 The Result of Homogeneity Post-Test of Experimental and Controlled Class
No Class
Variance N
F
value
F
table
Criteria 1.
Experimental 51.03
30 1.38
1.85 Homogenous
2. Controlled
36.84 30
The following is the writer’s assumption:
Ho : the data of homogenous variance H
1
: the data of un homogenous variance The criteria is Ho accepted if F
value
1.85 and rejected if F
value
1.85 with α = 5.
According to table 4.11, it can be seen that F
value
is smaller than F
table
, with the closest critical value of 29 with degree of significance 0.05 which is F
value
F
table
1.81 1.85. It shows Null Hypothesis Ho is accepted and the data of post-test group sample was taken from homogeneous population.
5. T-Test Formulation
For testing the hypothesis of the study, the writer used t-test formulation. The symbol “X” in the calculation was used to represent the gain score of experimental
class students and symbol “Y” represent the gain score of controlled class students.
The following description is the calculation of the formulation: Table 4.12
The Comparison of the Students’ Gain Score of Students’ Experimental Class and Controlled Class Student
No Score
x = X - ̅
y = Y - ̅
x
2
y
2
X Y
1. 9
7 -4.46
2.40 19.89
5.76 2.
13 15
-0.46 10.40
0.21 108.16
3. 20
4 6.54
-0.60 42.77
0.36 4.
5 -8.46
-4.60 71.57
21.16 5.
8 9
-5.46 4.40
29.81 19.36
6. 21
4 7.54
-0.60 56.85
0.36 7.
12 -1.46
-4.60 2.13
21.16 8.
9 3
-4.46 -1.60
19.89 2.56
