of SMP Negeri 1 Pati had the same chance become the samples of the study. Then I took three classes randomly, namely class VIII-A, VIII-B, and VIII-G. I took
class VIII-A as the experimental class, class VIII-B as the control class and class VIII-G as the try-out class.
3.11 Research Variables
A great deal of research is carried out in order to explore the strength of relationships between variables. To get the goal of the study, I tried to identify the
variable. Brown J. D. 1988:7 states that “in simplest terms, a variable is something that may vary or differ”. There are two kinds of variables, namely
independent variable and dependent variable Johnson, 1987:165. This experiment that used visualization in Desuggestopedia teaching method to
improve the students‟ reading comprehension has two variables. The variables in this study are:
1 The independent variable X
Tuckman 1978:58 states that “the independent variable, which is a stimulus variable or input, operates either within a person or within his or
her environment to effect behavior.” In this study, the independent variable was the method of teaching reading
recount text of the both groups, that was the use of visualization in Desuggestopedia teaching method to improve the students‟ reading
comprehension. There
were treatments,
using visualization
in
Desuggestopedia teaching method for the experimental group and using conventional method for the control group.
2 The dependent variable Y
Tuckman 1978:59 states that “the dependent variable is that factor which is observed and measured to determine the effect of the independent
variable, that is, that factor that appears, disappears, or varies as the experimenter introduces, removes, or varies the independent variable.” It
is a response variable or output, and an observed aspect of the behavior of an organism that has been stimulated.
The dependent variable was the students‟ achievement in reading comprehension of recount text. This study was meant to study the effect of
supporting material, in this case, the use of visualization in Desuggestopedia teaching method to the students of eight grade students
of SMP Negeri 1 Pati. Those two variables became the focus of this study. Basically, this study
was conducted in order to find out the relationship between two variables or the influence a variable has on another variable.
3.5 Experimental Design
