Mean 22.30
3.50 The scores are processed from
the students’ answer sheets
As it can be inferred from the table of the gained scores above, the students in the experimental class have siginificant improvement in their score of
the pre-test and the post test. The average of the gained score in the experimental class is 22.30, while in the controlled class is 3.50. The experimental class got a
higher average score than the controlled class. From this result, the writer assumed that the experimental class has a significant improvement, which means
that the treatment given was effective to increase their understanding towards the simple past tense. Meanwhile, the lowest gained score in the experimental class is
-3, while in the controlled class is -34. Furthermore, the highest gained score in the experimental class is 53 and in the controlled class is 30. The median of the
gained score in the experimental class is 25 and in the controlled class is 3.5. Then, the mode of the gained score in the experimental class is 30 and in the
controlled class is 3.
B. Data Analysis
In this section the writer will describe the result of the t-test of the three types of scores presented in the data description. Those are pre-test scores, post-
test scores and gained scores. The t-test is the statistical analysis which was performed by using SPSS Statistical Product and Statistic Solution. Here are the
description of the t-test by using SPSS:
1. t-test Analysis of Pre-test
The result of the t-test for the pre-test in the experimental and controlled class is peresented in the table 4.4 in the next page.
Table 4.4 The
t-test of the Pre-test Scores in the Experimental and the Controlled class
From the table above, it is known that the significant level for the differences of the pre-test score is .011, which is lower than .05. This finding
means that there is a significant difference between the experimental class and the controlled class in their pre-test score. It means that both classes have different
backgrond characteristic before the intervention. From the table 4.4 above, it is also known that the mean score of the experimental class is 43.90 and the
controlled class is 60.15. In other words, the average score of the experimental group
N Mean
Std. Deviation
Std. Error Mean
Total CONT 20
60.15 24.508
5.480 EXP
20 43.90
12.078 2.701
Total Equal variances
assumed Equal variances not
assumed Levenes Test for
Equality of Variances
F 17.527
Sig. .000
t-test for Equality of Means
T 2.660
2.660 Df
38 27.715
Sig. 2-tailed .011
.013 Mean Difference
16.250 16.250
Std. Error Difference 6.110
6.110 95 Confidence
Interval of the Difference
Lower 3.882
3.729 Upper
28.618 28.771
class is lower than the controlled class. Besides, the mean difference from both classes is 16.250. Furthermore, interval of the difference has between 3.882 and
28.618.
2. t-test Analysis of post-test
After the writer got the result of the t-test score of pre-test both in the experimental class and in the controlled class, the t-test for post-test is also done
in both classes, as in the table 4.5 below:
Table 4.5 The
t-test of the Post-test Scores in the Experimental and Controlled Class
group N
Mean Std. Deviation
Std. Error Mean Score
EXP 20
66.20 11.879
2.656 CONT
20 63.65
15.772 3.527
Score Equal variances
assumed Equal
variances not assumed
Levenes Test for Equality of Variances
F 3.463
Sig. .071
t-test for Equality of Means
T .578
.578 Df
38 35.308
Sig. 2-tailed .567
.567 Mean Difference
2.550 2.550
Std. Error Difference 4.415
4.415 95 Confidence
Interval of the Difference
Lower -6.388
-6.411 Upper
11.488 11.511
Kategori