Description of Data An Item Analysis On Discriminating Power Of English Summative Test (An Observation at the Seventh Grade of SMP Al Wathoniyah 09 East Jakarta)

32 35 Number Thirty Five 4.00 36 Number Thirty Six 4.00 L O W E R G R O U P 37 Number Thirty Seven 3.80 38 Number Thirty Eight 3.80 39 Number Thirty Nine 3.80 40 Number Forty 3.80 41 Number Forty One 3.80 42 Number Forty Two 3.80 43 Number Forty Three 3.60 44 Number Forty Four 3.40 45 Number Forty Five 3.40 46 Number Forty Six 3.40 47 Number Forty Seven 3.00 48 Number Forty Eight 3.00 Table 4.1 shows that students who are taking the test are classified into 3 groups; upper group, middle group and lower group. The writer took 27 or 13 students from upper and lower group to be analyzed. The highest score in upper group is gained by one student in score 6.40. The lowest score in upper group is gained by one student in score 4.80. Meanwhile the highest score in lower group is gained by one student in the same score 4.00. So, the lowest score in lower group is gained by one student in score 3.00. 33 From the table 4.2 in the appendix page 47, it can be concluded that the responses of each item of upper group students in their English test are: 1. There are 13 students who answered the item no 27 and 33 correctly. 2. There are 12 students who answered the item no 9, 12, 17, 21, 34 and 36 correctly. 3. There are 11 students who answered the item no 3, 24, 30, 43 and 45 correctly. 4. There are 10 students who answered the item no 7, 8, 13, 26, 29 and 47 correctly. 5. There are 9 students who answered the item no 1, 10 and 39 correctly. 6. There are 8 students who answered the item no 46 correctly. 7. There are 7 students who answered the item no 2, 22 and 49 correctly. 8. There are 6 students who answered the item no 5, 6, 16, 35, 37 and 40 correctly. 9. There are 5 students who answered the item no 15, 18 and 19 correctly. 10. There are 4 students who answered the item no 11 and 28 correctly. 11. There are 3 students who answered the item no 4, 14, 20, 23, 31, 32 and 38 correctly. 12. There is 1 student who answered the item no 25, 42, 44, 48 and 50 correctly. 13. There is 0 student who answered the item no 41 correctly. 34 From the table 4.3 in the appendix page 49, it can be concluded that the responses of each item of lower group students in their English test are: 1. There are 11 students who answered the item no 30 correctly. 2. There are 10 students who answered the item no 12 correctly. 3. There are 9 students who answered the item no 1, 24, 33 and 36 correctly. 4. There are 8 students who answered the item no 2, 7, 17, 21, 29 and 39 correctly. 5. There are 7 students who answered the item no 3, 8, 15, 20, 27, 34 and 43 correctly. 6. There are 6 students who answered the item no 9, 22 and 47 correctly. 7. There are 5 students who answered the item no 26, 40, 45, 46 and 49 correctly. 8. There are 4 students who answered the item no 4, 10, 13, 37 and 44 correctly. 9. There are 3 students who answered the item no 5, 6, 32 and 50 correctly. 10. There are 2 students who answered the item no 11, 14, 16, 18, 25, 38 and 41 correctly. 11. There is 1 student who answered the item no 23, 28, 31, 42 and 48 correctly. 12. There is 0 student who answered the item no 19 and 35 correctly. 35 Before the writer analyzes the data, the writer has calculated the data into statistic calculation. The writer used Discrimination Index Formula to find the discriminating power criteria of English summative test. The table is as follows: Table 4.4 The Discriminating Power Index of the Upper and Lower Group Item Number Total Correct Answer U - L DI = U - L Remark Upper Group Lower Group 1 9 9 0.00 Poor 2 7 8 -1 0.08 Poor 3 11 7 4 0.31 Satisfactory 4 3 4 -1 0.08 Poor 5 6 3 3 0.23 Satisfactory 6 6 3 3 0.23 Satisfactory 7 10 8 2 0.15 Poor 8 10 7 3 0.23 Satisfactory 9 12 6 6 0.46 Good 10 9 4 5 0.38 Satisfactory 11 4 2 2 0.15 Poor 12 12 10 2 0.15 Poor 13 10 4 6 0.46 Good 14 3 2 1 0.08 Poor 15 5 7 -2 -0.15 Very poor 16 6 2 4 0.31 Satisfactory 17 12 8 4 0.31 Satisfactory 18 5 2 3 0.23 Satisfactory 19 5 5 0.38 Satisfactory 20 3 7 -4 -0.31 Very poor 21 12 8 4 0.31 Satisfactory 22 7 6 1 0.08 Poor 23 3 1 2 0.15 Poor 24 11 9 2 0.15 Poor 25 1 2 -1 -0.08 Very poor 26 10 5 5 0.38 Satisfactory 27 13 7 6 0.46 Good 28 4 1 3 0.23 Satisfactory 29 10 8 2 0.15 Poor 30 11 11 0.00 Poor N 36 31 3 1 2 0.15 Poor 32 3 3 0.00 Poor 33 13 9 4 0.31 Satisfactory 34 12 7 5 0.38 Satisfactory 35 6 6 0.46 Good 36 12 9 3 0.23 Satisfactory 37 6 4 2 0.15 Poor 38 3 3 0.00 Poor 39 9 9 0.00 Poor 40 6 9 -3 -0.23 Very poor 41 2 -2 -0.15 Very poor 42 1 1 0.00 Poor 43 11 7 4 0.31 Satisfactory 44 1 4 -3 -0.23 Very poor 45 11 5 6 0.46 Good 46 8 5 3 0.23 Satisfactory 47 10 6 4 0.31 Satisfactory 48 1 1 0.00 Poor 49 7 5 2 0.15 Poor 50 1 3 -2 -0.15 Very poor 37 Based on the data above, the percentage of discriminating power English summative test is: Table 4.5 The percentage of Discriminating Power No. Discriminating Power Total Item Percentage Item Number 1 Excellent 2 Good 5 10 9, 13, 27, 35, 45 3 Satisfactory 18 36 3, 5, 6, 8, 10, 16, 17,18, 19, 21, 26, 28, 33, 34, 36, 43, 46, 47 4 Poor 20 40 1, 2, 4, 7, 11, 12, 14, 22, 23, 24, 29,30, 31, 32, 37, 38, 39, 42, 48, 49 5 Very poor 7 14 15, 20, 25, 40, 41, 44, 50 The table above shows that there are 0 test item 0 is categorized into excellent test item, which is no showed by the test item number. It is categorized as excellent test item because its discriminating index is in range between 0.70 – 1.00. There are 5 test items 10 are categorized into good items, that range from 0.40 – 0.70, they are test item number 9, 13, 27, 35 and 45. There are 18 test items 36 are categorized as satisfactory test items for their discriminating index are in range 0.20 – 0.40, they are test items number 3, 5, 6, 8, 10, 16, 17, 18, 19, 21, 26, 28, 33, 34, 36, 43, 46 and 47. Meanwhile, 20 test items 40 are categorized into poor test items because their discriminating index are range in 0.00 – 0.20, they are test items number 1, 2, 4, 7, 11, 12, 14, 22, 23, 24, 29,30, 31, 32, 37, 38, 39, 42, 48 and 49. At last, there are 7 test items 14 are categorized as very poor item as their discriminating index are range in negative values, they are test items number 15, 20, 25, 40, 41, 44 and 50. 38

B. Data Analysis

In analyzing the discriminating power of the data, the writer listed the students’ responses of each number of the test firstly. The list can be seen in the table 4.2 and table 4.3 of this “skripsi”. Then the next step is to make a format of item analysis. This format is calculated the data from the groups are upper and lower group in table 4.4. The last step is to count into statistic calculation from the discriminating power formula: DP = Correct U – Correct L N Explanation: DP = Discriminating Power U = Sum of the students from the upper group who answered correctly L = Sum of the students from the lower group who answered correctly N = Number of the candidates in one group The result of this last step can be seen also in the table 4.4. In this table, result of each item will be in decimal then the writer categorized each item according to this formula: The classifications of the index of discriminating power DI or discriminating power are: DI = 0.07 – 1.00 = Excellent 0.40 – 0.70 = Good 0.20 – 0.40 = Satisfactory ≤ 0.20 = Poor Negative value on D = Very Poor The result is interpreted by using the criteria: If DP is 0.20 to 1.00 = Good ≤ 0.20 = Revise Negative value on D = Discard or rewrite 39 Based on the data of item analysis result in discriminating power above, the writer can conclude that from 50 items: 1. There are 5 numbers 10 which are categorized into good test items, that range is 0.46 and according to Anas Sudijono in Pengantar Evaluasi Pendidikan that teacher should be entered or recorded in the bank’s book about achievement test. 2. There are 18 numbers 36 which are categorized as satisfactory test items because their discriminating index are in range 0.23 – 0.38, the test item test should be entered or saved. 3. There are 20 numbers 40 which are categorized into poor test items because their discriminating index range in 0.00 – 0.15, the item test can be revise. 4. There are 7 test items 14 which are categorized as very poor test item as their discriminating index range in negative values that -0.08 – -0.31, the item test should be discard or rewrite. 2

C. Data Interpretation

For whole items, the writer can interpret that the discriminating power of English summative test prepared by Government Service of East Jakarta or Dinas Jakarta Timur , tested at the seventh grade of “SMP Al Wathoniyah 09 ” East Jakarta. The analyzing result from the summative test that the test, the writer has found test item that category belongs to poor discriminating power, because there are 20 test items can not differentiate the upper and the lower group. In the theory by Anas Sudijono in “Pengantar Evaluasi Pendidikan” that the classification criteria of DP is 0.20 to 1.00 is good satisfactory, good, and excellent that the test item from summative test of SMP Al Wathoniyah 09 East Jakarta is good because there are a summation of the criteria from good and satisfactory to 46 good = 10 and satisfactory = 36, is more than from criteria of poor 40. 2 Ibid., p. 408 40 One of the items has good discriminating power is an item no 9, because of 12 students from the upper group who answered the item no 9 correctly and only 6 students from the lower group who answered the item no 9 correctly. So, the item can tell as the good item because test item can differentiate the upper and the lower group and the discriminating power 0.46. Then, the item has satisfactory discriminating power is an item no 3, because of 11 students from the upper group who answered the item no 3 correctly and only 7 students from the lower group who answered the item no 3 correctly. So, the item can tell as the satisfactory item because test item can differentiate the upper and the lower group and the discriminating power 0.31. Next, one of the items has poor discriminating power is an item no 1 as the poor item because test item can not differentiate the upper and the lower group or same and the discriminating power 0.00. The last, the item has very poor discriminating power is an item no 15 because of 7 students from the lower group who answered the item no 15 correctly rather than 5 students from the upper group who answered the item no 15 correctly. So, the item can tell as the very poor item because the item cannot differentiate the upper and the lower group and the discriminating power -0.15 negative. From the analysis data above, it can be conclueded that the English Summative Test at the seventh grade of SMP Al Wathoniyah 09 East Jakarta has a good discriminating power so that the question from the summative test should be saved or can be used to next test.