Statistical Hypothesis RESEARCH METHODOLOGY

17 95 80 18 95 90 19 100 100 20 70 60 21 80 80 22 75 85 23 95 95 24 80 95 25 95 95 26 85 80 27 70 90 From the Table 4.1 above, it could be seen that the scores of pretest and posttest in experimental class were quite various. The lowest score of the pretest given to 27 students was 60. And even after the treatment was given to the experimental class, 60 were still the lowest score in the posttest. Not different from the lowest score of pretest and posttest, the highest score of the pretest and posttest given to 27 students was the same, which were 100. The further information about the pretest and posttest score can be seen trough the Table 4.2 and 4.3 below. Table 4.2 Frequency Distribution Table of Pretest Result of Experimental Class No Interval Value Frequency 1 30-40 - 2 41-50 - 3 51-60 3 4 61-70 5 5 71-80 4 6 81-90 7 7 91-100 8 Total 27 Table 4.3 Frequency Distribution Table of Posttest Result of Experimental Class No Interval Value Frequency 1 30-40 - 2 41-50 - 3 51-60 2 4 61-70 3 5 71-80 6 6 81-90 6 7 91-100 10 Total 27 The frequency distribution depicted in Table 4.2 and 4.3 were based on the pretest and posttest result in experimental class. It could be seen that there were a decrease in the number of students who get score between 51 and 60. In pretest, there were 3 students who get the score between 51 and 60, and in posttest it decreased into 2 students. A decrease was also happened to the students who get score in interval 61 —70 and 81—90. In interval 61—70, the frequency of the students decreased from 5 into 3 students only while in interval 81 —90 the frequency of the students decreased from 7 into 6 students. Overall, there were 1 to 2 decreases of students in interval 51 —60, 61—70, and 81—90. And it means that the students who get lower score in posttest were fewer compared to the pretest result. In addition to decreasing in some interval values, intervals 71 —80 and 91— 100 were on increase. There were 2 increases of students in both intervals. It means that the students who get higher score in posttest are increased than in pretest. In interval 71 —80, the frequency of the students increased from 4 into 6 students and in interval 91 —100 the frequency of the students increased from 8 into 10 students. For more details, the comparison between pretest and posttest results can be more clearly seen on the Figure 4.1 below. Figure 4.1 Bar Diagram of Pretest and Posttest Comparison of Experimental Class The Figure 4.1 above showed the comparison between pretest and posttest result in experimental class. The higher and lower frequency could be easily compared as the blue block represented pretest result and the red block represented posttest result. b. The Data of Control Class Table 4.4 Pretest and Posttest Score of Control Class Students Y Pretest Posttest 1 95 65 2 100 85 3 90 90 4 80 95 5 95 95 6 95 95 7 85 65 8 90 75 9 85 100 10 80 85 11 95 95 2 4 6 8 10 12 30-40 41-50 51-60 61-70 71-80 81-90 91-100 Fr e q u e n cy Interval Value Experimental Class Pretest Posttest