4.1.4 Treatment
In
conducting the experiment, the experimental and control group were given treatments after pre-test for three times. The first treatment of control group was
on March 12
th
2011, the second was on March 25
th
2011, and the last treatment was on March 26
th
2011. Whereas the first treatment of experimental group was on March 22
nd
2011, the second one was on March 25
th
2011, and the last one was on March 30
th
2011. The purpose of these treatments of experimental group was to find out whether Corse Review Horay technique is effective to teach simple
past tense or not. On the other hand, the purpose of the treatment of control group was to teach simple past tense using conventional method, and the worksheet is
done individually.
4.1.5 Post-test
Post-test was given after all treatments had been already done. The post-test was held on April 1
st
2011. The test items were the same as the pre-test that was 40 items the post test can be seen on appendix 11.
4.2 Try-out Test Analysis
Item tests analysis of try out include validity, reliability, Discriminating power, and difficulty level. The discussion will be discussed as follows:
4.2.1 Validity
The validity is used to know whether the item of test is valid or invalid. It was taken from the students‟ try-out test result. The invalid item means should be
dropped, while the valid item means the item will be used in the pre-test and post test that will be given to treatment group and control group.
The validity of item pre-test and post test analysis r
hitung
were consulted
to
critical value r product momen , for α= 5 with n=33, the result of R
table
= 0.344
XI IPS 3, and α= 5 with n=34, the result of R
table
= 0.399 XI IPS 3. Since the
result value was higher than the critical value r
hitung
r
tabel
, it was assumed that the instrument was valid. Contrary, if the result value was smaller than critical
value r
hitung
r
tabel
, it was assumed that the instrument was invalid. In the pre-test tryout test there were 8 invalid items, while in post-test tryout test there were 6
invalid items. The complete analysis can be seen in appendix 12.
4.1.2 Reliability
The computing of reliability of the pre-test try-out instrument was 0,7 for α
significance level =5 with n=33, the result of r
table
= 0.344. The computing of reliability of the post-test try-out instrument was 0,78
for α significance level
=5 with n=34, the result of r
table
= 0.399. Since the result of computation value was higher than the critical value, it was concluded that the instrument used in this
research was reliable. The complete analysis can be seen in appendix 12.
4.1.3 Discriminating Power
From the computation of discriminating power of the item test, for Pre-test try-out test was obvious that most items were significanc
e. It was shown by the “t” was higher than t-
table, however, there were 10 poor items because the “t” was less than t-table, and it meant that the 10 items of question should be dropped. In post-
test try-out test was also obvious that most items were significance, however there were 8 poor items and it should be dropped or unused. The complete analysis can
be seen on appendix 12.
4.1.4 Difficulty Level
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