28
CHAPTER III RESEARCH METHOD
A. Research Design
This research was an experimental study with one factor research design, two samples, and a co-variable. One factor was the effect of local wisdom-based
scientific approach. Two samples of the research consisted of one group that was as the treatment class and the other group was as the control class. The co-variable
wa s students’ prior knowledge, which was collected by using documentation data
of the previous chemistry achievement.
B. Time and Research Place
This research was done on January until February 2015. The place for research is at State Senior High School 1 Purworejo, addressed at Tentara Pelajar
Street 55, Purworejo, Central Java.
C. Variable Definition
This research consisted of three variables: 1.
Independent Variable Independent variable in this research was chemistry learning using local
wisdom- based scientific approach. 2.
Dependent Variable Dependent variables in this research were students’ achievement, social
maturity, and learning discipline. Students’ achievement was the result mark of students’ answers on validated problems questions of Oxidation and Reduction
29
Materials. Social maturity and learning discipline were from questionnaire results. Measurements were done twice, which were before and after chemistry learning
process. 3.
Controlled Variable Controlled variable in this research was
students’ prior knowledge from documentation data.
D. Population, Sample, and Sampling Technique
1. The Population of the Research
The population of this research was grade ten students of State Senior High School 1 Purworejo in academic year of 2014 2015. The number of students
was 224 students divided into 7 classes, they were X MIA 1 until X MIA 7. 2.
The Sample of the Research The samples of this research were the ten grade students of State Senior
High School 1 Purworejo 2014 2015 who were in second semester. They were 64 students in two classes. X MIA 2 was as treatment class and X MIA 3 was as
control class. 3.
The Technique of Sampling The technique of sampling was purposive sampling by which the samples
were taken with specific objectives and based on the consideration of researcher. The objective of this sampling technique is to have effective learning in well-
conditioned class, which can achieve learning objectives.
30
E. The Instruments of the Research and the Technique of Collecting Data
Kategori