No. Students’
Code Pre-test
Score Post-test
Score Gain
Score
11 K
66 75
9 12
L 57
53 -4
13 M
91 93
2 14
N 66
64 -2
15 O
75 74
-1 16
P 72
66 -6
17 Q
76 82
6 18
R 76
71 -5
19 S
67 60
-7 Total Score
1293 1294
1 Mean Score
68.05 68.10
0.05
Based on the table above, the tests which were given to the experimental class pointed the pre-test mean score of students was 68.05. Moreover, the student’s
lowest score in the pre-test was 32 while the highest score was 91. After being treated by peer-assessment, the mean score of the post test was 68.10. The
result of the post-test which has the lowest score was 46 and the highest score was 93. The finding pointed out that the mean score of both pre-test and post-test was
not quite increasing. It was just about 0.05 of the score gained. On the other hand, the gain score between pre-test and post-test in the experimental class was pointed
out that the lowest gain score was -19 and the highest was 32.
2. The Pre-Test Score and The Post Test Score of Controlled Class
The controlled class was administered at X.3 of SMA Negeri 11 Tangerang Selatan which consisted of 39 students but only 19 of the students’
paper of it which were qualified to be evaluated. Here, the result of the students’ test:
Table 4.2 The Pre-Test and Post Test of Controlled Class
No. Student’s
Code Pre-
Test Post- Test
Score’s Gain
1 A
70 68
-2 2
B 94
95 1
3 C
70 82
12 4
D 61
66 5
5 E
62 63
1 6
F 70
54 -16
7 G
95 63
-32 8
H 71
61 -10
9 I
72 67
-5 10
J 70
70 11
K 69
70 1
12 L
64 70
6 13
M 61
70 9
14 N
61 70
9 15
O 72
74 2
16 P
83 66
-17 17
Q 74
65 -9
18 R
76 74
-2 19
S 69
74 -5
The total Score 1364
1322 -52
Mean Score 71.79
69.57 -2.73
Based on the table above, the total score of the students’ pre-test score was 1364. The result of the students’ mean score in the pre-test was 71.79. While
the lowest score of the students was 61 and the highest score was 95. Otherwise, the total score of the post-test score was 1322 which was giving the mean score
of the post-test score was 69.57. It has the lowest score of 54 and the highest score of 95. In addition, the lowest students’ gain score in the controlled class was
-32 which was taken from the student who got the highest score in the pre-test. On the other hand, the highest students’ gain score achieved 12.
B. Data Analyzing
Data Analyzing consists of normality test of pre-test, normality test of post- test, homogeneity test of pre-test, homogeneity test of post-test and also the t-test
of the data.
1. Normality Test a. Normality Test of Pre-Test
The normality of pre-test was used to know the normality data was in normal distribution or not. To gain the result of the normality of distribution data,
the research used Lilliefors as the medium. As the Lilliefors theory, the examination of normal distribution come from the proportional accumulation
equaled by the function of distribution on the distribution of normal probability.
1
Here is the result of SPSS output:
Table 4.3 The Result of Homogeneity of Pre-Test
No. Source
Experimental Controlled
1. N
19 19
2. Mean
68.05 71.79
3. Variance
139.27 95.28
4. Standard Deviation
11.80 9.761
5. Minimal Score
32 61
6. Maximal Score
91 95
7. T
count
0.01 0.01
8. T
table
0.30 9.
Conclusion Normal Distribution
1
Budi Susetyo, Statistika untuk Analisis Data Penelitian, Bandung: PT Refika Aditama, 2010, p. 148.
