Reliability and Item Analysis of Vocabulary Test

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3.7.2 Scoring System

In scoring the students result of the test, Arikunto`s formula was used. The ideal higher score is 100. The scores of the pre-test and post-test are calculated by using formula as follows: P = 100 P : The score of the test. F : The total of the right answers. N : The total items. Hatch and Farhady,1982:46.

3.8 Data Analysis

Analysis means categorizing, ordering, manipulating, and summarizing of data obtained to answer the research questions. The purpose of analysis is to reduce data to be intelligible and interpretable so that the relation of the research problem can be studied. Therefore, the data from the interview is collected and interpreted. Data in this research are analyzed quantitatively. There are some different statistical computations to answer each research question. To analyze the data, Statistical Package for Social Science SPSS program version 20 for windows is used. The data obtained from test are compared before and after treatment. Since there are two research questions in this research, the researcher described it one by one. The steps are described as follows. 43

3.8.1 Research Question 1

1. The score of students’ vocabulary achievement before and after the treatment in the experimental class are analyzed to find out the mean score. 2. The researcher analyzed the score of students’ vocabulary achievement before and after the treatment in the control class to find out the mean score. 3. The mean score of each vocabulary achievement are compared by using paired t-test to know the differences of vocabulary achievement before and after the treatment given. The significant level α which is used is 0.05.

3.8.2 Research Question 2

1. The score of vocabulary achievement from pre test and post test in the experimental class are analyzed to find the mean score. 2. The score of vocabulary achievement from pre test and post test in the control class are analyzed to find out the mean score. 3. The score of vocabulary achievement from pre test and post test are compared by using independent t-test to know the differences before and after the treatment given. The significant level α which is used is 0.05. The hypothesis are tested as follows. H o1 = there is no significant difference of vocabulary achievement before and after treatment. H A1 = there is a significant difference of the vocabulary achievement before and after treatment.