2.5 Theoretical Assumption
Considering the concepts described above, mastering vocabulary is an essential area of language in order to have more effective communication. The use of
derivational affixes is one of the most common ways which new words are created, so common in fact that a speaker will ensure if a word exists or they have
just created it. Derivational affix is effective in decreasing the students’ burden in
learning the vocabulary, because the material is not too difficult for the students since they have known the based word. It will be easier for the students to develop
new words. Moreover, by using derivational affixes the students will remember those vocabularies easily.
From the explanation above, the researcher assumes that teaching derivational
affixes can be used to achieve students’ vocabulary as long as they follow the
teaching learning process seriously.
2.6 Hypothesis
Based on the frame of theory and the theoretical assumption mentioned above, the
writer formulates the hypothesis as follows: There is a significant difference of
students’ vocabulary achievement before and after being taught through derivational affixes.
III. RESEARCH METHOD
This chapter discusses some aspects: research design, population and sample, data colleting technique, step in collecting data, instrument of the test, criteria of the
test, scoring system, data analysis, and hypothesis testing. They are classifying like the followings.
3.1 Research Design
This research is a quantitative study which has one group pretest-posttest design. The research selects one class as the experimental group using simple probability
sampling. The aim of this research is to find out whether there is a significant difference
of the student’s vocabulary achievement at the first grade of SMA Negeri 1 B.Lampung before and after being taught through derivational affixes.
T1 X T2
T1 = Pretest
X = Treatment
T2 = Posttest
Setiyadi, 2006:133
3.2 Population and Sample of the Research
The population of this research was the students at the first grade of SMA Negeri 1 B.Lampung. There were six classes of the first grade in that school. The number
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