From, the calculation from SPSS 15, we can see the mean score on the ir pretest and posttest as follows:
Descriptive Statistics
N Range
Minimum Maximum
Mean Std. Deviation
Variance PRETESTIAK
30 20,00
40,00 60,00
48,0333 5,77440
33,344 POSTTESTIAK
30 45,00
50,00 95,00
70,5667 12,37819
153,220 Valid N listwise
30
Table 14. The mean score of IAK students’ pretest and posttest
From the calculation above, we can conclude that the mean score for the pretest is 48.03. It means that from 100 of the total score, the students’ score in
IAK experimental group is 48.03 in average. Then, the mean score for the posttest is 70,56. It means that from 100 of the total score, the students’ score in
IAK experimental group is 70,56 in average.
2. Students’ Transcript on the Spoken Test
As we know that the test was divided into two forms, the written test and spoken test. It was expected that the students mastered procedural knowledge
rather than declarative knowledge. Thus, the students were able to apply the knowledge of simple past tense into the real communicative context. By doing so,
we can conclude that the students had mastered the simple past tense both written and orally.
As we can see from the result of the posttest, most of the students made some progress in uttering their utterances. It means that they could apply the
knowledge of simple past tense into the real communicative context, even though PLAGIAT MERUPAKAN TINDAKAN TIDAK TERPUJI
some of them still made few grammatical mistakes. The analysis of students’ transcript on the spoken test can be seen in the appendix 10.
B. Hypothesis Testing
This section includes the presentation of the normality of the data distribution and t-test calculation.
1. Normality of Data Distribution
As we know that the data should be normally distributed, the researcher checked the normality of the data distribution by using SPSS 15 Program. The
following is the result of the computation of the pretest and posttest of normality for IAK as the experimental group and IAP as the control group.
Table 15. Tests of Normality for IAK experimental group
Kolmogorov-Smirnova Shapiro-Wilk
Statistic df
Sig. Statistic
df Sig.
PRETESTIAK ,138
30 ,153
,931 30
,053 POSTTESTIAK
,103 30
,200 ,966
30 ,432
This is a lower bound of the true significance. a Lilliefors Significance Correction
Table 16. Tests of Normality for IAP control group
Kolmogorov-Smirnova Shapiro-Wilk
Statistic df
Sig. Statistic
df Sig.
PRETEST1AP ,142
30 ,126
,954 30
,212 POSTTEST1AP
,105 30
,200 ,978
30 ,765
This is a lower bound of the true significance. a Lilliefors Significance Correction
As we can see from the calculation above, the value of significance is higher than 0.05 a. Jogiyanto 2004:171 says that data is considered normally
distributed when the value of the significance is higher than 0.05 a. The value PLAGIAT MERUPAKAN TINDAKAN TIDAK TERPUJI
