The result of was 0.7873; for
α = 5 with N = 32, r
table
= 0.3388. It showed that
was higher than r
table
0.7873 0.3388. It could be concluded that the try-out test was reliable and belonged to good category because
.
7 ≤ 0.9
. It meant that the test could be used as instrument to get the data during
experiment.
3.5.2 Pre-Test
The pretest in this study had a purpose to know the students‟ basic ability on vocabulary achievement between the experimental and control groups. So, both of
groups were given the pre-test.
3.5.3 Treatment
After giving pre-test for both classes, the next plan was giving treatment. The treatment form of this study was teaching-learning process using vocabulary self-
collection strategy in the class. The process of giving treatment to make sure that the vocabulary self-
collection strategy gave effect to improve students‟ vocabulary achievement and to know whether vocabulary self-collection strategy
was more effective to teach vocabulary compared to interactive cloze strategy as conventional one.
The treatment was conducted for 2 meetings for each group. Each meeting needed 80 minutes and had different materials related to narrative text. However,
in this study the writer only focused on the students` vocabulary achievement. In experimental group, the students were taught about new concept of vocabulary
related to narrative text through vocabulary self-collection strategy. Different from the experimental group, in control group, the conventional strategy by using
interactive cloze was conducted in teaching narrative text. But all of the materials both in the experimental and the control group had the same difficulty level. The
following is schedule of giving treatment in both groups:
Table 3.4 Schedule of Giving Treatment Date
Control Group VIII C Date
Experimental Group VIII A
May 15
th
, 2015
First treatment by using interactive cloze strategy
May 15
th
, 2015
First treatment by using vocabulary self-collection
strategy
May 19
th
, 2015
Second treatment
by using interactive cloze
strategy May 20
th
, 2015
Second treatment by using vocabulary self-collection
strategy
3.5.4 Post-Test
The post-test was given after conducting the treatments. It purposed to measure the significant differences on the students` vocabulary achievement between the
experimental group which used vocabulary self-collection strategy in teaching
vocabulary and the control group which taught by the interactive cloze strategy. 3.6
Method of Analyzing Data
Data analysis of this research is a quantitative in which the data is measured in the form of numbers. After collecting the data, I analyzed them statistically.
In the present study, there were some steps of analyzing data, such as analyzing
nomality, homogeneity, and analyzing t-test result and hypotheses. 3.6.1
Normality
According to Arikunto 2006:290, normality test is a way to determine whether the data obtained are normal or not. In this study, I used the normality to prove
whether the pre-test and post-test of each group was normally distributed or not.
First, the maximum score and minimum score of both groups were calculated. Then, the range score, class interval and class width were determined. If the value
of X
2 hitung
X
2 table
αdk, the test for each group was said to be normally distributed. To compute normality, the writer used the formula as follows:
In which,
2
X
= Normality Oi
= Frequency of the real data Ei
= Expected frequency percentage of each bandwidth times by n Hypotheses:
Ho : The data distributed normally
Ha : The data not distributed normally
Ho was accepted if X
2 hitung
X
2 table
Arikunto, 2006:290
3.6.2 Homogeneity
