− −
them.
7
The analysis qualitative data used in this study is the observation of stude
nts’ activities during teaching-learning process, and the interview before and after CAR. Then, in analysis the quantitative data which is test, the writer
took the average of stude nts’ vocabulary score in one cycle. It is used to
measure how well studen ts’ ability on vocabulary. It used the formula:
8
To know the class percentage, the writer used the formula:
P : the class percentage F : total percentage
N : number of students
After getting mean of stude nts’ score per actions, the writer analyzed whether
there is any improvement of stude nts’ vocabulary score from pre-test up to
stude nts’ average score in each cycle or not. In analyzing that, the writer used
the formula:
P = x 100
P : percentage of stude nts’ improvement
y : pre-test result y1 : post-test 1
P= x 100
7
Sugiyono, Metode Penelitian Kuantitatif, Kualitatif dan R D, Bandung: Alfabeta, 2008, p. 334.
8
Ibid., p. 300.
P : percentage of stude nts’ improvement
y : post-test 1 y2 : post-test 2
G. The Trustworthiness of Test
To analyze the examined test items, the writer uses the trustworthiness of test. There are some ways including:
1. Test Validity Validity is the component criteria for evaluating the test or as a
measure of the test. It could be about the representation of test toward the material that is being given for the students. Milton added that validity
addresses whether a test measures what it is supposed to measure and not something else.
9
Before administering the pre-test, the writer analyzes the validity and the reliability of pre-test instrument in order to find out
whether the test is valid or good to be used. According to Arikunto, information will be valid if appropriate with the fact and the test will be
valid if it can be measure what it should be measure
10
Before administering the test, the writer used auditing by asking the advisor to review and evaluate the study to ensure the validity of the
instruments.
11
Then, after the students did the pre-test, she used the Anates software developed by Drs. KARNO To, M.Pd and Yudi Wibisono, ST to
calculate the instruments ’ validity and reliability scores.
Table 3.1 The criterion of
“koefisien korelasi”
12
Scale Remark
0.80 – 1.0
Very high
9
James Milton, Measuring Second Language Vocabulary Acquisition, British Library, 2009, p. 18.
10
Prof. Dr. Suharsimi Arikunto, Dasar-dasar Evaluasi Pendidik an,Jakarta: Bumi Aksara, 2010, pp. 58
– 59.
11
Creswell, op.cit., p. 259.
12
Prof. Dr. Suharsimi Arikunto. op.cit., p. 75.
