Population Population and Sample
choose the answer of 1 item correctly, they would get 10 score. Further, to get a total score, the writer used formula as following:
Total score = amount of true items 3
From the description of each test from above, the highest score of this test was 100 scores.
Before the test was given to the respondents, the researcher did a pilot study in SMP YPPUI Ciledug Tangerang to measure a validity and reliability to know
whether the test is acceptable or not to use in this research. In conducting the pilot study to measure the validity and reliability of the test,
the researcher did some steps as following: a. the researcher made test specification with 9 indicators see Appendix 1
b. the researcher made 50 test items based on the test specification. c. the researcher gave the test to students of VIII-I of SMP YPPUI Ciledug
Tangerang which consisted of 40 students. d. the researcher scored the test and measured the validity and reliability of
the test by using data analysis in SPSS Statistical Product and Service Solution software.
After measuring the validity and reliability by using data analysis in SPSS, the reliability value of this test was 0,939.
5
Weir states that “A correlation of 0,9 or above is normally considered a desirable level of marker reliability...”.
6
Further, according to Lado on
Hughes’ book, Testing for Language Teachers Second Edition, the reliability coefficient of test is different based on types of language
tests. Lado states that “Good vocabulary, structure and reading tests are usually in
the .90 to .99 range”.
7
Hence, this test fulfilled the good reliability of vocabulary, structure and reading test.
5
Appendix 3, Validity and Reliability Test
6
Cyril J. Weir, Languange Testing and Validation, New York: Palgrave Macmillan, 2005, p.201
7
Arthur Hughes, Testing for Language Teachers Second Edition, Cambridge: Cambridge University Press, 2003, p. 39
Further, the result of the test validity was as following:
8
Table. 3.1 Valid and Invalid Test Items
Total of Test Items Valid Item
Invalid
50 42
8
Because the researcher only took 30 questions for pre- test and post- test, the researcher eliminated 8 invalid questions and 12 valid questions with lowest r -
value in each indicator.
9
Table. 3.2 Number of Eliminated Questions
Test Specification Number of
Questions Number of Eliminated
Questions
1. Disajikan
sebuah kalimat
rumpang, siswa dapat melengkapi kalimat tersebut dengan comparative
adjective positive form yang sesuai. 1, 5, 17, 26, 34,
42, 50 5, 17, 50
2. Disajikan
dua buah
objek gambar dan kalimat rumpang, siswa
dapat melengkapi kalimat tersebut sesuai dengan gambar yang disajikan.
2, 4, 7, 18, 20, 28, 44
4, 20, 28
3. Disajikan
sebuah kalimat
rumpang, siswa dapat melengkapi kalimat tersebut dengan comparative
adjective superlative form of more than two syllables yang sesuai.