made in the sufficient level of difficulty. The results of the try out were analyzed by using the degree of the test items difficulties. The formula was as follows:
= × 100
notes: JJB
: the number of the students who answered the test items correctly JPT
: the number of the students who participated in the test P
: the difficulty index The criteria of difficulty index:
0.00-0.19 : difficult 0.20-0.80 : sufficientfair
0.81-1.00 : easy
Djiwandono, 1996:141 The total number of the test items was 36 items. The time allocation that was given to
the students was 30 minutes. Since the result of homogeneity test was homogenous, the researcher chose the class for the Try Out test randomly by using lottery. The try
out was held in a class which belonged neither to the experimental group nor the control group. The result was class VII A which consisted of 36 students as the class
for the try out test.
c. Post Test
The post test here was the vocabulary achievement test that was given to both the experimental group and control group after the treatments given by the researcher.
It had a purpose to know whether or not the students had mastered the materials taught in the teaching learning process. The number of the test items in this research
was 30 items in the form of multiple choices. The post-test was administered in 40 minutes.
3.5.2 Interview
McMillan 1992:132 says that interview is a form of data collection in which questions are asked orally. In this research, interview was conducted with the English
teacher of SMPN 14 Jember to get the supporting data about the English curriculum used at the school, the English text book and the teaching technique used by the
teacher. Guided interview was used to get information needed. Therefore a list of questions was used as the interview guide during the process of interview.
3.5.3 Documentation
According to Arikunto 2006:158 documentation method could be in the form of books, magazine, document, regulations, and daily notes. This method was
used to support the primary data in this research. It was about the names of the respondents the experimental group and the control group of the seventh grade
students’ at SMPN 14 Jember.
3.6 Data Analysis Method
Data analysis method was a way to analyze the data of vocabulary test and the results were analyzed by using t-test formula. The result was used to know whether or
not there is an effect of using Word Cards on vocabulary achievement of the seventh grade students at SMPN 14 Jember.
The result of data analysis was consulted to the t-table of 5 level confidence interval 95 and the degree of freedom or Df = Nx+Ny-2 to know
whether or not the results had a significant difference. If the result of t-test is the same or greater than that of t-table, the null hypothesis would be rejected and the
alternative hypothesis would be accepted. It means that the result of the research shows there is a significant effect of using Word Cards on the students’ vocabulary
achievement. The formula of t-test was as follows:
= +
+ 2
1 +
1
where: =
and =
notes: t
: the value of t Mx
: mean score of the experimental group My
: mean score of the control group x
: individual score deviation of the experimental group y
: individual score deviation of the control group Nx
: the number of respondents in the experimental group Ny
: the number of respondents in the control group Arikunto, 2006:311
CHAPTER 4 RESEARCH RESULTS AND DISCUSSION
This chapter presents the description of the treatment, the results of the supporting data, the result of homogeneity test, the analysis results of try out test, the
result of primary data, the hypothesis verification, and the discussion. Further discussion about the results of this research will be presented below.
4.1 The Descriptions of the Treatment
