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Questionnaire The Technique of Collecting Data

1. Discriminating Power

The analysis of discriminating power of test items is to know the performance of the test through distinguishing students who have high achievement and low achievement. Discriminating power provides more detailed analysis of the test items than does item difficulty, because it shows how the top scores and lower scores performed on each item. 39 The computing of discriminating power uses the formula following: 40 = − In which, D : The Index of discriminating power U : The number of pupils in upper group who answered the item correctly L : The number of pupils in lower group who answered the item correctly N : Number of pupils in each of groups Next, the discriminating scale uses: Table 3.1 The Classification of Discriminating Power DL REMARKS 0.6 – 10 Very good 0.4 – 0.6 Good 0.1 – 0.3 Ok -1 – 0.0 Bad 39 Kathleen M. Bailey, Learning about Language Assessment: Dillemas, Decisions, and Direction London: Heinle Heinle Publisher, 1998, p. 135. 40 Wilmar Tambunan, Evaluat ion of St udent s Achievem ent , Jakart a: Depdiknas, 1998, p.139

2. Difficulty Items

The researcher analyzes the students’ test. It is categorized into high, medium, and low. In this study the researcher compares the difficulty items analysis by comparing students who answer correctly with all of students who follow the data. The formula which is used is: = P : Index of difficulty R : the total number of students who selected the correct answer T : the total number of students including upper and lower group The criterion using as follow: Table 3.2 The Classification of Difficulty Level DL REMARK 0 – 0.30 High 0.30 – 0.79 Medium 0.80 – 1.00 Low

N. The Criteria of the Action Success

The researcher will know the students’ success and failure in doing this action research. In this study, the criteria success research based on when there 70 students could pass the target score of pre-test, post test 1 and post test 2 of the Minimum Mastery Criterion – Kriteria Ketuntasan Minimal KKM at SMPN 238 Jakarta, where the writer did her research in 60 sixty. So if when there 70 students could pass the target score of pre-test, post test 1 and post test 2 of the Minimum Mastery Criterion – Kriteria Ketuntasan Minimal KKM, it means that the research could be called success, and the researcher can stop the next action.

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