Students Experimental Class Controlled Class
26 50
78 27
83 80
28 80
75 29
73 70
30 68
68 31
75 48
32 50
60 ∑
2285 2374
̅Mean 71.41
74.19 The Table 4.2 shows
the students’ post-test scores in experimental class and controlled class. The post-test was given to the students after they got treatments
on reading narrative text. Each class had different treatments in order to increase their reading score on narrative text. According to the Table 4.2, it can be seen
that the lowest score of post-test in the experimental class was 48 and the lowest score of post-test in the controlled class was 33. Then, the highest score of post-
test in the experimental class was 95 and the highest score of post-test in the controlled class was 93. The mean score of post-test in the controlled class was
higher than the mean of post-test in the experimental class. The mean of post-test in the controlled class was 74.19 and the mean of pre-test score in the
experimental class was 71.41. Table 4.3
The Students’ Gained Scores
Students Experimental Class Controlled Class
1 5
8 2
15 15
Students Experimental Class Controlled Class
3 8
-5 4
3 -18
5 13
-7 6
18 20
7 -7
10 8
13 -18
9 -5
7 10
8 8
11 13
-37 12
13 -3
13 13
13 14
3 3
15 10
25 16
10 -5
17 28
33 18
-3 5
19 10
25 20
10 21
-3 22
7 23
7 -7
24 -5
-10 25
10 23
26 -3
-12 27
3 5
28 3
5 29
-7
Students Experimental Class Controlled Class
30 16
-2 31
25 3
32 -10
32 ∑
203 133
̅Mean 6.34
4.16 The Table 4.3 shows
the students’ gained scores in experimental class and controlled class. In the experimental class, the highest gained score was 28 and
the lowest gained score was -10. Meanwhile, the highest gained score in the controlled class was 32, and the lowest gained score was -37. In addition, the
mean of gained scores in the experimental class was higher that the mean of gained score in the controlled class. The mean of gained scores in the
experimental class was 6.34 and the mean of gained score in the controlled class was 4.16.
2. Data Analysis
Before the t-test formula was calculated to see the hypothesis of the study, the normality and homogeneity of the data should be analyzed. The normality of
the data was needed in order to see if the data was normally distributed in both experimental class and the controlled class or it was not normally distributed.
After the normality of the data has been tested, the next step was to test the homogeneity of the data. It was needed to see if the data were homogenous or
heterogeneous. a. The normality of the Data
To test the normality of the data, the Lillyfors formula was used. The result can be seen by comparing the value of L
max
to L
table
. The maximum dispute obtained from the calculation must be in positive value +.
The hypothesis can be seen as follows: H
a
: The data of X is not normally distributed. H
o
: The data of X is normally distributed. Then, the criteria of the hypothesis are:
H
a
: L L
table
H
o
: L ≤ L
table
- If L
max
L
table
, H
o
is rejected and H
a
is accepted. It means that the data of X is not normally distributed.
- If L
max
L
table
, H
o
is accepted and H
a
is rejected. It means that the data of X is normally distributed.
1 Normality of the Experimental Class a Normality of the Pre-test
Table 4.4 The Normality of Pre-test
After the pre-test data of the experimental class has been calculated using Lillyfors formula, the result shows if the L
max
L
table
0.09485 0.1592. It means that the H
o
was accepted, the pre-test data of the experimental class was normally distributed.
∑ [
∑ ̅ ]
[ ]
[ ] √
̅ L
max
= 0.09485 L
tab
= 0.1592
b Normality of the Post-test
Table 4.5 The Normality of Post-test
After the post-test data of the experimental class has been calculated using Lillyfors formula, the result shows if the L
max
L
table
0.10975 0.1592. It means that the H
o
was accepted, the post-test data of the experimental class was normally distributed.
2 Normality of the Controlled Class a Normality of the Pre-test
Table 4.6 The Normality of Pre-test
After the post-test data of the experimental class has been calculated using Lillyfors formula, the result shows if the L
max
L
table
0.1358 0.1592. It means that the H
o
was accepted, the post-test data of the experimental class was normally distributed.
∑ [
∑ ̅ ]
[ ]
[ ] √
̅ L
max
= 0.10975 L
tab
= 0.1592
∑ [
∑ ̅ ]
[ ]
[ ] 5
√
̅ L
max
= 0.1358 L
tab
= 0.1592
b Normality of the Post-test
Table 4.7 The Normality of Post-test
After the post-test data of the experimental class has been calculated using Lillyfors formula, the result shows if the L
max
L
table
0.1002 0.1592. It means that the H
o
was accepted, the post-test data of the experimental class was normally distributed.
Note: The value of L
table
itself was gotten from the table of Lillyfors. In significance degree of 0.05, L
0,0532
= 0.1592. b. Homogeneity of the Data
According to the normality calculation using Lillyfors formula, it can be concluded that the data of pre-test and post-test in both experimental class and
controlled class was normally distributed. The next step was calculating the homogeneity of the data.
The hypothesis can be seen as follows: H
o
: The sample of experimental class and controlled class is not different. H
a
: The sample of experimental class and controlled class is different. Then, the criteria of the hypothesis are:
H
o
: F F
αn1-1, n2-1
H
a
: F F
αn1-1, n2-1
∑ [
∑ ̅ ]
[ ]
[ ] √
̅ L
max
= 0.1002 L
tab
= 0.1592
