2. Sample
In choosing the sample, the writer used purposive sampling technique. The purposive sampling technique was determined by certain consideration. This
consideration was based on the teacher’s judgement. The teacher judged that class 8.1 has the highest score than the other two classes at the same grade
while class 8.2 and class 8.3 have almost same average score, so the writer selected 70 students of those classes
– class 8.2 and class 8.3 as the samples. After selecting the samples, the writer gave pre-test to class 8.2 and class
8.3. The result of pre-test shows that the students at class 8.3 got higher result that the students class 8.2. Moreover, the writer decided to treat class 8.2 with
crossword puzzle game and later we called it as experimental class. Meanwhile, class 8.3 will be treated without crossword puzzle game and later
we called it as controlled class.
D. Technique of Collecting Data
The technique of collecting data was done in order to achieve the goal of the study. The technique of collecting data was used in this study is filed research;
the writers came directly to the school to conduct the study to obtain accurate data. The research instrument that was used in this study is test instrument and
non-test instrument.
1. Test Instrument
Test instrument used to measure the result of students’ score in English
subject was objective test with the kind of question is multiple choices that consists of 25 questions. Each questions has one 1 point for the correct
answer and zero 0 point for the wrong answer. This test conducted in pre-test and post-test.
The pre-test for the students is carried out to get their score. The students were given a multiple choice test about vocabulary. This test did to know
students’ ability about vocabulary. The post-test was given in multiple choices also. This test did to know improving students’ ability in vocabulary after the
writer taught the vocabulary by using crossword puzzle game.
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