homogeneity test, it was found that the population or all the classes of the eighth grade students was homogeneous.
2. Taking two classes by using lottery and they were determined to be the experimental group and the control group.
3. Giving the treatments to the experimental group by teaching vocabulary by using crossword puzzle and the control group was not taught
vocabulary by using crossword puzzle, but it was taught vocabulary by using Question and Answer technique.
4. Administering the vocabulary try out test to establish validity, reliability, and difficulty index of teacher-made test and analyzing the results. The
try out test was given to the other class that did not belong to the experimental group or the control group. Besides, the try out test was
administered to know whether the time allocation was appropriate or not and whether the instruction was clear or not.
5. Giving the vocabulary post-test to both groupsclasses to know the result of the treatments given, or to know the students’ vocabulary
achievement after the treatment given. 6. Analyzing the deviation of post-test by using t-test formula of 5
significance level to know the mean score of the two groups, whether the mean difference was significant or not.
7. Finding the Degree of Relative Effectiveness since the result of t-test was significant.
8. Drawing a conclusion from the results of the data analysis to answer the research problem.
3.2 Area Determination Method
Area determination method is one of the methods that is important to determine before doing the research. Purposive sampling takes the subject based
on a certain purpose Arikunto, 2006:139. The research area of this research was MTs Kebunrejo Banyuwangi.
This area was determined purposively by considering some reasons. The first reason was that crossword puzzle had never been used by the teacher in
teaching vocabulary in this school. The second reason was the research about the use of crossword puzzle had never been conducted in this school. The third
reason was the researcher got permission from both the school principal and the English teacher to conduct this experimental research in this school.
3.3 Respondent Determination Method
Population is the whole subjects in the research Arikunto, 2006:130. Furthermore, Fraenkel and Wallen 2009:105 say that population refers to all
the members of a particular group, it is the group of interest to the researcher, the group to whom the researcher would like to generalize the results of a study.
The population of this research was the eighth grade students of MTs Kebunrejo Banyuwangi that consisted of six classes; they are VIII A, VIII B, VIII C, VIII
D, VIII E, and VIII F. Fraenkel and Wallen 2009:90 say that sample refers to any part of a
population of individuals on whom information is obtained. To define the sample of the research, the researcher used cluster random sampling technique.
A cluster random sample is one obtained by using groups as the sampling unit rather than individuals Fraenkel and Wallen, 2009:95. In this research, the
researcher took two classes from the population as the samples. The samples were determined after administering the homogeneity test. The homogeneity
test was administered to six classes of the eighth grade students of MTs Kebunrejo Banyuwangi as the population. After that, the results of the
homogeneity test were analyzed by using Analysis of Variance ANOVA. Since, the result of the homogeneity test showed that those six classes were
homogeneous, the researcher took two classes randomly by using lottery to determine the experimental group and the control group.
3.4 Data Collection Methods
