Muhammad isha Juarsa THE EFFECT OF ROLE PLAY LEARNING METHOD TO STUDENT’S ACHIEVEMENT IN
PHOTOSYNTHESIS TOPIC Universitas Pendidikan Indonesia
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CHAPTER III RESEARCH METHOD
A. Type of Research
This research is quantitative method, using experimental research. By considering the condition of each class in this Junior high school, which each
class has different capabilities of student. For example, class VIII-A has a better academic achievement and english capability rather than VIII-B and
VIII-C, so researcher would like to choose pre-experimental research especially one group pretest posttest study which only use one class so that
this research would be on target and representative.
B. Research Design
One group pretest – posttest study design will be used in this research.
The one-group pretest-posttest design is a research design where one group of participants is pretested on the dependent variable and then posttested after the
treatment condition has been administered. This is a better design than the one- group posttest-only design because it at least includes a pretest, that indicates
how the participants did prior to administration of the treatment condition. The design could be seen clearly as the diagram shown below:
Key: O
1
= Pretest O
2
= Posttest X = Treatment
One Group Pretest – Posttest Study
O
1
X O
2
Muhammad isha Juarsa
THE EFFECT OF ROLE PLAY LEARNING METHOD TO STUDENT’S ACHIEVEMENT IN PHOTOSYNTHESIS TOPIC
Universitas Pendidikan Indonesia |
repository.upi.edu |
perpustakaan.upi.edu
Figure 3.1 : Diagram of one group pretest – posttest study
As the name suggest, one group pretest posttest comprises pretest and posttest as its main data. In this design, the effect is taken to be the difference
between the pretest and posttest scores. It does not control for potentially confounding extraneous variables such as history, maturation, testing,
instrumentation, and regression artifacts, so it is still difficult to identify the effect of the treatment condition.
C. Population and Sampling
Population of students is taken from one of the school in Bandung. Meanwhile the sample of students is taken in grade VIII-A since
photosynthesis chapter is learnes in this grade. The class itself is taken by purposive sampling.
D. Research Variable
