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Internal Validity Control Technique of Analyzing the Data

35

CHAPTER IV RESEARCH FINDINGAND INTERPRETATION

A. Research Finding

1. Data Description

The data were gained from the tests, they were pre-test and post-test to the students of VIII.A and VIII.B. Before going to the further calculation about the data, the following are the descriptions of pre-test and post-test result from both experiment and controlled class: Table 4.1 Students’ Score of VIII.B Experiment Class Student Pre-test X 1 Post-test X 2 Gained Score 1. 32 60 28 2. 24 52 28 3. 42 72 30 4. 36 68 32 5. 24 52 28 6. 44 72 28 7. 48 80 32 8. 24 44 20 9. 56 64 8 10. 64 92 28 11. 64 84 20 12. 42 72 30 13. 60 72 12 14. 40 72 32 15. 36 64 28 16. 20 44 24 Student Pre-test X 1 Post-test X 2 Gained Score 17. 56 80 24 18. 32 60 28 19. 36 52 16 20. 36 68 32 21. 44 76 32 22. 42 64 22 23. 56 76 20 24. 52 60 8 25. 36 64 28 26. 32 68 36 27. 52 64 12 28. 44 68 24 29. 24 44 20 30. 52 72 20 31. 52 76 24 32. 44 76 32 N =32 ∑X 1 = 1346 Average: 134632 = 40.06 ∑X 2 = 2132 Average: 213232 = 66.62 ∑X=786 Average: 78632 = 24.56 The Table 4.1 above illustrated the students’ pre-test and post-test average scores. The students’ average pre-test score from the class VIII.B as the experimental class was 40.06 and the average posttest score was 66.62. Whereas the average gained score among pre-test and post-test scores were 24.56. The following are some of the differences score from students’ pervious scores pretest with students’ post-test scores. It is explained in the distribution table of pre-test and post-test scores to see the frequency of the distribution of the score from both experiment and control class. 1. Statistical Data of Pretest of Experimental Class - Range: H – L 64 – 20 = 44 - Class = 1 + 3.3 log n = 1 + 3.3 log 32 = 1 + 3.3 1.50 = 5.95 = 6 - Interval = R = 44 = 7.33 = 7 C 6 Note: H = Higher Score L = Lower Score Table 4.2 Frequency of Pre-test of Experimental class Score Interval score F Percentage 24 —30 5 15 31 —37 11 34 38 —44 8 25 45 —51 1 3 52 —58 4 12 59 —65 3 9 N= 32 2. Statistical Data of Posttest of Experimental Class - Range: H – L 92 – 44 = 48

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