Table 4.2 The Score of Pre-test and Post-test Controlled Class
Student Pre-test
Post-test Gained Score
1 56
56 2
46 50
4 3
70 70
4 60
63 3
5 56
50 -6
6 53
50 -3
7 76
76 8
60 50
-10 9
56 50
-6 10
56 56
11 66
56 -10
12 60
66 6
13 80
80 14
66 66
15 46
60 14
16 80
90 10
17 76
80 4
18 56
60 4
19 36
43 7
20 36
46 10
21 70
86 16
22 46
43 -3
23 60
56 -4
24 73
66 -7
25 80
90 10
26 66
66 27
40 46
6 28
60 66
6 29
70 76
6 30
60 70
10
Total 1816
1883 67
Mean 60.53
62.77 2.23
The table 4.2 above described that the mean of the pre-test in the controlled class was 60.53. Besides, the mean of the post-test was 62.77.
The highest score in pre-test was 80 and the lowest score in pre-test was 36. While, the highest score in post-test was 90 and the lowest score in post-test
was 43. This is the histogram graph.
Figure 4.2 Graph of Students’ Pre-test and Post-test Score in Controlled Class
B. Data Analysis
The writer analyzed the normality and homogeneity of the data before analyzing the t-test. The normality of the data was needed in order to see
whether the data was normally distributed in experimental class and the controlled class or it was not normally distributed. Then, the writer calculated
the homogeneity of the data. The homogeneity of the data was needed to see whether the data were homogenous or heterogeneous.
1. The Normality of the Data
The writer used Lillyfors formula to test the normality of the data. The result could be seen by comparing the value of T
max
to T
table
. The maximum dispute T got from the calculation must be in positive value +.
10 20
30 40
50 60
70 80
90 100
S tu
d e
n t 1
S tu
d e
n t 2
S tu
d e
n t 3
S tu
d e
n t 4
S tu
d e
n t 5
S tu
d e
n t 6
S tu
d e
n t 7
S tu
d e
n t 8
S tu
d e
n t 9
S tu
d e
n t 10
S tu
d e
n t 11
S tu
d e
n t 12
S tu
d e
n t 13
S tu
d e
n t 14
S tu
d e
n t 15
S tu
d e
n t 16
S tu
d e
n t 17
S tu
d e
n t 18
S tu
d e
n t 1
9 S
tu d
e n
t 20 S
tu d
e n
t 21 S
tu d
e n
t 22 S
tu d
e n
t 23 S
tu d
e n
t 24 S
tu d
e n
t 25 S
tu d
e n
t 26 S
tu d
e n
t 27 S
tu d
e n
t 28 S
tu d
e n
t 29 S
tu d
e n
t 3
Students Score in Controlled Class
Pre-test Post-test
The criteria of the hypothesis are: H
1
: T T
table
H
o
: T T
table
- If T
max
T
table
, H
o
is rejected and H
a
is accepted. It means that the data of X is not normally distributed.
- If T
max
T
table
, H
o
is accepted and H
a
is rejected. It means that the data of X is normally distributed.
The hypothesis can be seen as follows: H
o
: The data of X is normally distributed. H
a
: The data of X is not normally distributed.
a. Normality of the Experimental Class
1. Normality of the Pre-test
s
2 =
Σ f n
− [
Σ f n
]
=
− [ ]
=
. − [ . ]
=
. − .
=
.
SD = √ .
= 9.64 x̅ = 54.73
2 2
2
T
table
= 0.161 T
max
= 0.12793 The result showed that T
max
T
table
0.12793 0.161. It can be concluded that in the significant degree of 0.05, H
o
is accepted. It means that the data is normally distributed.
2. Normality of the Post-test
The hypothesis can be seen as follows: H
o
: The data of X is normally distributed. H
a
: The data of X is not normally distributed.
s
2 =
Σ f n
− [
Σ f n
]
=
− [ ]
=
. − [ . ]
=
5904.16 −
.
=
.
SD = √
. = 11.52
x̅ = 75.97 T
table
= 0.161 T
max
= 0.0922
The result showed that T
max
T
table
0.0922 0.161. It can be concluded that in the significant degree of 0.05, H
o
is accepted. It means that the data is normally distributed.
2 2
2
b. Normality of the Controlled Class
The hypothesis can be seen as follows: H
o
: The data of Y is normally distributed. H
a
: The data of Y is not normally distributed. 1.
Normality of the Pre-test
s
2 =
Σ f n
− [
Σ f n
]
=
− [ ]
=
3815.93 −[ . ]
=
3815.93 −
.
=
.
SD = √
. = 12.33
x ̅= 60.53 T
table
= 0.161 T
max
= 0.116 The result showed that T
max
T
table
0.116 0.161. It can be concluded that in the significant degree of 0.05, H
o
is accepted. It means that the data is normally distributed.
2 2
