Quasi-Experimental Design Research Design

3.1.1 Quasi-Experimental Design

According to CresweIl 2009: 158, “in quasi-experiments, the investigator uses control and experimental groups but does not randomly assign participants to group e.g. they may be intact groups available to the researcher ”. It has many examples of designs, for instance, single-group interrupted lime-series design, control-group interrupted lime-series design, and non-equivalent pre-test and post-test control-group design. In this study, the writer administeredpre-test and post test with experimental and control groups design. Creswell 2009: 160 states that in this design, “the experimental group A and the control group B are selected without random assignment. Both of groups took a pre-test and post-test, but only the experimental group received the treatment ”. Therefore, the writer administered a pre-test and a post-test for experimental and control groups, but there was only one group the experimental group which was taught by using List-Group-Label LGL strategy. The design of the experiment can be described as follows: Figure 3.1 Quasi-Experimental Design Group A O1 X O2 --------------------------------------- Group B O3 O4 in which: Group A : experimental group Group B : control group O 1 : pre-test of experimental group O 2 : post-test of experimental group O 3 : pre-test of control group O 4 : post-test of control group X : treatment List-Group-Label LGL strategy. Based on the research design above, the writer involved two groups to conduct this study. First, an experimental group which received treatment by using List-Group-Label LGL strategy. Second, a group which was taught by using regular method as a control group. In order to measure the two group‟s initial ability, a pre-testwascarriedout. The experimental group received the treatment by using List-Group-Label LGL strategy, but the control group was taught by using regular method. The writeradministeredpost-test for both groups to measurethe students‟ achievement after they received the treatment.

3.2 Population and Sample