Data Description Research Finding

14 Student 14 79 Student 14 75 15 Student 15 81 Student 15 83 16 Student 16 86 Student 16 83 17 Student 17 79 Student 17 80 18 Student 18 81 Student 18 84 19 Student 19 79 Student 19 80 20 Student 20 81 Student 20 79 21 Student 21 79 Student 21 77 22 Student 22 79 Student 22 79 23 Student 23 79 Student 23 69 24 Student 24 82 Student 24 78 25 Student 25 79 Student 25 84 Total Score 2021 1951 Mean 80.84 78.04 The table 4.2 above informs that the mean score of post-test in experimental class was 80.84, and the mean score of post-test in controlled class was 78.04. It is means that there was a significant score of experimental class and controlled class in post-test, controlled class was increased in post-test session than in pre-test. But, for this session, the experimental class got the higher score than the controlled class. It proves that there is effect of picture series on students’ writing ability of recount text. Chart 4.2 The students’ score of post-test of experimental class and control class After showing the comparison of students’ pre-test and post-test scores, the table shows the gained score among those two classesthe gained score can be seen from the increasing score of students’ pre-test scores compared with students’ post-test scores. Table 4.3 The students’ gained scores comparison between pre-test and post-test in experimental class VIII-1 and controlled class VIII-2 Gained Score No. Experimental Class Score Controlled Class Score 1 Student 1 -2 Student 1 14 2 Student 2 8 Student 2 2 3 Student 3 8 Student 3 6 4 Student 4 12 Student 4 -1 5 Student 5 8 Student 5 -3 6 Student 6 13 Student 6 -2 2 4 6 8 10 12 14 16 X Class Y Class Post-Test Score Nilai 69-75 Nilai 76-80 Nilai 81-86 7 Student 7 10 Student 7 -3 8 Student 8 7 Student 8 2 9 Student 9 6 Student 9 -2 10 Student 10 5 Student 10 8 11 Student 11 6 Student 11 4 12 Student 12 14 Student 12 -3 13 Student 13 16 Student 13 5 14 Student 14 6 Student 14 7 15 Student 15 15 Student 15 8 16 Student 16 9 Student 16 2 17 Student 17 10 Student 17 4 18 Student 18 11 Student 18 4 19 Student 19 2 Student 19 5 20 Student 20 4 Student 20 3 21 Student 21 11 Student 21 2 22 Student 22 2 Student 22 2 23 Student 23 14 Student 23 -1 24 Student 24 11 Student 24 4 25 Student 25 7 Student 25 4 Total Gained Score 213 71 Mean 8.52 2.84 The table 4.3 showed that the minimum gained score of experimental class was -2 and the minimum score of controlled class was -3. The highest score of experimental class is 16 and controlled class is 14. The average gained score of experimental class was 8.52 and for controlled class was 2.84. Chart 4.3 The students’ gain score of experimental class and controlled class

2. Data Analysis

The data of the students’ was analyzed by using t-test to prove whether there was any significant different between the students’ writing ability of recount text in experimental class as the X variable and controlled class as the Y variable. But, before using the formula of t- test, the students’ score in the experimental and controlled class were tabulated to calculate the gained score of each class. It can be seen as follows: Table 4.4 Statistical Calculation of Gained Score Both the Experimental and Controlled Group Class No. X Y X-MX Y-MY X- MX² Y-MY² 1 -2 14 -11 11 121 121 2 8 2 -1 -1 1 1 3 8 6 -1 3 1 9 4 12 -1 3 -4 9 16 5 10 15 20 25 X Class Y Class Gain Score Gain -3-5 Gain 6-10 Gain 11-15 Gain 16-20 5 8 -3 -1 -6 1 36 6 13 -2 4 -5 16 25 7 10 -3 1 -6 1 36 8 7 2 -2 -1 4 1 9 6 -2 -3 -5 9 25 10 5 8 -4 5 16 25 11 6 4 -3 1 9 1 12 14 -3 5 -6 25 36 13 16 5 7 2 49 4 14 6 7 -3 4 9 16 15 15 8 6 5 36 25 16 9 2 -1 1 17 10 4 1 1 1 1 18 11 4 2 1 4 1 19 2 5 -7 2 49 4 20 4 3 -5 25 21 11 2 2 -1 4 1 22 2 2 -7 -1 49 1 23 14 -1 5 -4 25 16 24 11 4 2 1 4 1 25 7 4 -2 1 4 1 Total 213 71 -12 -4 472 404 Mean 9 3

18.88 16.16

According to the data in the table above, the result of the students’ pre-test and post-test further in each class is calculated by using t-test in some steps as follows: 1. Determining mean of variable X, with formula as follows: 2. Determining mean of variable Y, with formula as follows: 3. Determining standard of deviation score of variable X, with formula as follows: √ √ √ 4. Determining standard of deviation score of variable Y, with formula as follows: √ √ √ 5. Determining standard error of mean of variable X, with formula as follows: √ √ √ 6. Determining standard error of mean of variable Y, with formula as follows: √ √ √ 7. Determining standard error of different mean of variable X and variable Y, with formula as follows: √ √ √ √