Pearson Product Moment was used in this research to know the correlation of both variables.
D. Population and Sample of the Research
The population of this research was about six classes of second grade which consist of 177 students. Because the number of population was too big, the writer
considered to take sample for collecting data. In taking sample, the writer used purposive sampling techniques because of some considerations. The first thing
was the ability of the population was same. The 8C class was selected as sample of this research because this class has the same ability with other classes, so that
this class can be representative one. The consideration of practicality and efficiency of time, energy, and fund could be another issue in taking this sample.
E. Instruments of the Research
In conducting a research, it is necessary to use an instrument for collecting data. The instruments can be a test, interview or questioner based on the research
need. In this research, the instruments which were used were test and the result of the test. Because the variables were vocabulary and reading, the test consisted of
vocabulary test and reading test. 1.
Vocabulary test. The questions of vocabulary test were compiled from second grade books
and other sources that were appropriated with their level and their material. Then, kinds of vocabulary tests were to find the synonym, antonym, and
meaning based on the context of the descriptive sentences. 2. Reading Test
Students were asked to read and answer the questions of reading. The reading material and its question were selected from students’ book and
other sources which was suitable with their level. The questions that were given were to find topic, main idea, supporting details, true or false, etc in a
descriptive text.
The questions of vocabulary and reading that were compiled were about 30 questions each of them, so the total was 60 questions appendix 3 and 4. Before
doing the research, those questions were tried out to other students that had the same level with the sample of the research in order to know the quality of the
instruments such as validity, reliability, index difficulty and discriminating power. So that the instruments are appropriate for the sample of the research.
After conducting the try out, the writer found the result of vocabulary and reading score and put it into Anates application to count the quality of the
questions. The result shown some questions of vocabulary and reading that were valid, very significant, significant, and adequate should be revised.
Table 3.1 Item Validity of Multiple Choices on Vocabulary Test
Category No.
Very Significant
Significant Adequate
Need to be revised
Insignificant
2, 3, 4, 5, 7, 25 6, 10, 11, 13,
15, 18, 19, 24, 29
8, 9, 12, 16, 20, 22, 23, 26, 27,
28 1, 14, 17, 21,
30
Total 6
9 10
5
Table 3.2 Item Validity of Multiple Choices on Reading Test
Category No.
Very Significant
Significant Adequate
Need to be revised
Insignificant
5, 8, 9, 10, 11, 15, 17, 18, 19,
20, 23, 25 2, 4, 27, 28
3, 6, 7, 12, 14, 26, 29
1, 13, 16, 21, 22, 24, 30
Total 12
4 7
7 Appendix 5 and 6 to know the quality of the test.
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