Where: O1: pre-test X: treatment
O2: post-test
B. Population and Sample
1. Population
The population of the research was the eighth grade classes of SMP N 1 Prambanan Klaten that consist of seven classrooms and each class has about
32 students, so the total number of the population were 213 students for second grade.
2. Sample
The researcher chose the sample from two classes that have similar characteristics. They are class VIII D and VIII E, there are 32 students in each
class. One of the classes became be the control group and the other one became the experimental group. VIII E became the control group and VIII D
became the experimental group.
C. Variable of the Research
There were two variables used in this research. Those are:
a. The Independent Variable
Independent variable was the use of inquiry activity in teaching writing skills as the teaching strategy.
b. The Dependent Variable
Dependent variable was the result of using inquiry activity which can be defined as students’ writing ability.
D. Instrument of the Research
1. Research Instrument
The instrument used to collect the data was a writing test. The test material is based on the Standard of Competence and Basic Competencies of
the School Based Curriculum of Junior High School of Year VIII of the second semester of English subject.
The instrument is an essay type text consisting one question. The English writing competences Junior High School grade VIII is visualized in
Table 3.
Table 3: English Writing Competences of Junior High Schools Grade VIII of the Second Semester
Standard of Competence
Basic Competence Indicators
12. Students express meaning in short
functional texts and short essays in the
form of narrative texts in the daily life
context. 12.1. Students express
meaning and short essays using written
language accurately in the forms of narrative
text interact with other in the daily life
context. - Students are able to identify a
narrative text. - Students are able to get the
meaning from unfamuliar words based on the text.
- Students are able to identify the generic structure of narrative
text - Students are able to use
language features of narrative text.
-Students are able to understand the context of the text.
Meanwhile, blue print of the writing ability test that is used as a concept in making test presented in Table 4.
Table 4: The Blueprint of the Writing Ability Test No. Indicators
Aspects of Writing The Item
Number
1. Writing a narrative text
a. Content b. Organization
c. Vocabulary d. Language use
e. Mechanics 1
2. Validity of the Instrument
Hughes 2003 states that the term ‘validity’ in testing and assessment has taken understood to mean discovering whether a test measures accurately
what it is ended to measure. In this study, the researcher used a writing test to measure the students’ writing ability. The validity that is applied in the
writing test is content validity.
a. Content validity
Content validity is achieved by ensuring that the content of the test fairly samples the class of field of situations or subject matter in question. To
achieve the content validity, it is usually done using expert judgments. These may be subject teacher, or language teachers who have many years’
experience in teaching business English. Fulcher and Davidson:2007. In this study, the writing tests are develop in reference to the
Competence and Basic competencies of School Based Curriculum of the eighth grade of first semester of the English Subject in Junior High School.
Then, the judge is asked to look at the tests and evaluate them for their representativeness within the content area.
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