Experimental Class Control Class
No Student
Score No
Students Score
25 25
85 25
25 85
26 26
90 26
26 85
27 27
80 27
27 95
28 28
70 28
28 70
29 29
80 29
29 80
30 30
90 30
30 75
31 31
80 31
31 85
32 32
85 32
32 85
33 33
75 33
33 60
34 34
85 34
34 75
35 35
75 35
35 70
36 36
80 36
36 65
37 37
85 37
37 65
38 38
75 38
38 60
39 39
80 39
39 75
∑ 3085
∑ 2880
Mean 79.10
Mean 73.85
According to Table 4.2, in the experimental class, the highest pre-test score was 90 while the lowest pre-test score was 55. On the other hand, in the
control class, the highest pre-test score was 95 while the lowest pre-test score was 45. Moreover, in the experimental class, the average score or mean was 79.10, the
mode is 80, and the median was 80.00. On the other hand, in the control class, the average score or mean was 73.85, the mode was 70, and the median was 75.00
From the students’ post-test score mean, median, and mode, it can be concluded that students from the experimental class gained an improvement in
their test score due to Jigsaw technique. To know the significance of the improvement, t-test was conducted and reported in the data analysis.
3. Gain Score
Gain score is a score that is calculated by subtracting the post-test score with the pre-test score. Therefore, to get gain score students from the experimental
group and the control group must follow the pre-test and post-test. These are the
description:
Table 4.3 The Gain Score of Experimental class and Control Class
Experimental Class Control Class
No Student
Score No
Students Score
1 1
-5 1
1 2
2 5
2 2
5 3
3 10
3 3
4 4
30 4
4 10
5 5
5 5
6 6
6 6
-35 7
7 7
7 5
8 8
10 8
8 9
9 5
9 9
-5 10
10 -5
10 10
15 11
11 11
11 -10
12 12
10 12
12 5
13 13
10 13
13 20
14 14
-5 14
14 15
15 15
20 15
15 10
16 16
16 16
10 17
17 -5
17 17
10 18
18 18
18 5
19 19
-20 19
19 15
20 20
20 20
20 -5
21 21
5 21
21 5
22 22
-5 22
22 5
23 23
-10 23
23 10
24 24
20 24
24 40
25 25
15 25
25 10
26 26
15 26
26 15
27 27
5 27
27 5
28 28
10 28
28 29
29 15
29 29
-5 31
31 35
31 31
32 32
-5 32
32 5
33 33
5 33
33 5
34 34
5 34
34 5
35 35
35 35
Experimental Class Control Class
No Student
Score No
Students Score
36 36
-5 36
36 -5
37 37
37 37
15 38
38 38
38 -5
39 39
39 39
-15
∑ 185
∑ 165
Mean 4.74
Mean 4.23
On Table 4.2, we can see that highest gain score from the experimental class was 35 and the lowest score was -20. Later on, from the control class the
highest gain score was 40 and the lowest score was -35. This calculation result indicates that some students, both in experimental class and control class,
performed better in their post-test than in their pre-test. But, in the other hand, some students performed worst in their post-test than in their pre-test.
In addition, based on the data on the Table 4.2, the average gain score for experimental class was 4.74, while the mode was 0, and the median was 0.
Meanwhile, the average gain score for experimental class was 4.23, while the mode was 5, and the median was 5.
4. Data Testing
In this research, the test of normality distribution and homogeneity variances taken from students’ pre-test and post-test scores was performed before
the calculation of t
test
value. It was done to determine if the data set was well- modeled by a normal distribution and to compute how likely it is for a random
variable underlying the data set to be normally distributed.
a. Normality of the Pre-test
The test of normality distribution of the pre-test data was analyzed by the use of Kolmogorov-Smirnov test in IBM SPSS Statistics 20. The result of the test
can be seen as follows:
