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48 This part presents about population of the study, sample of the study, and
sampling of the study.
1. Population
The population of this study was all of the eighth graders of MTs NW Penedagandor in the academic year of 2010-2011. The eighth graders of MTs NW
Penedagandor were divided into four classes that are VIII-A, VIII-B, VIII-C, VIII-D which consisted of 120 students and each class consisted of 30 students.
2. Sample
The sample of the research used was two classes of MTs NW Penedagandor, at the eighth graders in the academic year of 20102011.
The eighth graders of VIIIA was treated as experimental class which consisted of 30 students and class VIIIB was treated as a control class which also
consisted of 30 students. From the result of interest questionnaire, 50 of low interest group and 50 of high interest group were taken from both classes of
experimental class and control class. So, there were 15 students with high and 15 student’s low interest who were taught by test taking teams for experimental class,
and 15 students with high and 15 students low interest who were taught by direct instruction model for control class.
3. Sampling
The sampling technique used in this study was cluster random sampling. Cluster sampling was used for determining which class was used as an
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49 experimental class and which class was used as a control class. In this case, all
members of selected groups have similar characteristic. Based on this idea, cluster sampling is a sampling technique that chooses the sample of study by taking
certain classes that have similar characteristic. Each class was divided into two groups, students who have high interest
and those who have low interest. One of the two classes was taught by test taking teams and other class was taught by direct instruction model, so there were four
groups: 1 students with high interest who were taught by test taking teams; 2 students with high interest who were taught by direct instruction model; 3
students with low interest who were taught by test taking teams; 4 students with low interest who were taught by direct instruction model.
D. Technique of Collecting Data
