developed to overcome this difficulty faced by the researchers.
5
Therefore, the
writer cannot randomize the sample, because if the sample was selected randomly, the sample would be heterogen which would be difficult to conduct the research.
2. Research Design
Based on Christensen, quasi experimental design is divided into seceral design which are nonequivalent comparison group design, time-series design, and
regression discontinuity design.
6
From those three designs, the writer used nonequivalent comparison group design, because the limitation of the time and
number of population in this study made it was not possible to use time lapse and regression design, as it might take a longer time and there might be a cut of some
number of the sample that have been selected. Christensen added that when a better design cannot be used, nonequivalent comparison group design is
frequently recommended.
7
By using nonequivalent comparison group design, the writer did not randomly assign research units to experimental and control class.
8
It means that the writer cannot randomly assign the treatment given to the sample group and so
does in assigning experimental and control group. In this design, one treatment group and one no-treatment comparison group are used, with a pretest and posttest
observation for each condition.
9
Based on that, this study engaged one experimental class and one control class. The writer selected two out of five
classes of the same level through a test about narrative text. Two classes that have been selected then were given a pretest. After that, the experimental class was
treated by teaching narrative text using mind mapping technique while control class was taught narrative text without using mind mapping technique.
Furthermore the posttests were given to both of the classes and the results were compared. Nonequivalent comparison group design is formulated as follow:
5
Sugiyono, op. cit.
6
Christensen, op. cit., p. 328.
7
Ibid., p. 332.
8
Hong, op. cit.
9
Heath, op. cit., p. 258.
Table 3.1 Nonequivalent comparison group design
10
Where: : Pretest of both experimental and control class.
: Posttest of both experimental and control class. X: Implementation of teaching narrative text using mind mapping technique.
C. Population and Sample of the Research
1. Population
The population of this study was the second grade students of MAN 19 Jakarta. It consists of 144 students divided into 5 classes
—IPA, IPS I, IPS II, Agama I, and Agama II. The population number is shown in a table below:
Table 3.2 Population
Class IPA
IPS I IPS II
Agama I Agama II
Number of Students
27 31
31 27
28 144
10
Christensen, op. cit., p. 332.
Pre-response measure
Treatment Post-response
measure Difference
Experimental class
X -
Compare Control class
-
