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Level of Difficulty Discrimination Power Instrument of the Research

 0.20 – 0.39 = Low reliability  0.00 – 0.19 = Very low reliability Hatch and Farhady, 1982:268

3.8 Level of Difficulty

Level of difficulty is used to look for the level of test that is given to the students. For seeing the level of difficulty, the researcher used the following formula: In which: LD : Level of Difficulty U : The proportion of the upper group students L : The proportion of the lower students N : The total number of students who following the test The criteria are: 0.30 : difficult 0.30-0.70 : average 0.70 : easy Shohamy, 1985:79

3.9 Discrimination Power

Discrimination power is the extent to which the items discriminate between the testers, separating the more able testers from the less able. For determining discrimination power, the researcher used the following formula: In which: DP : Discrimination power U : The proportion of the upper group students L : The proportion of the lower students N : The total number of students The criteria are: DP: 0.70-1.00 : Excellent DP: 0.40-0.69 = Good DP: 0.20-0.39 = Satisfactory DP: 0.00-0.19 = Poor DP: - Negative = Bad item, should be omitted Heaton, 1975:182

3.10 Instrument of the Research

The instrument of this research was a set of listening ability test that would be used for pre- test and post-test. This pre-test was aimed to know the students’ former ability in listening before they are being taught using English song. Then the post-test was aimed to know the students ability in listening after they were taught English song. According to Mikado and Matsumoto in Danahar 1994:4, to improve the reliability of listening ability tests, they suggests to increase the number of question and introducing more multiple-choice items. In line with the statement above, the test that used by the writer was an objective test in form of 1 multiple choices of 10 items and True-False question 10 items,pronountion 10 items,vocabulary 10 items in 90 minutes time with four alternative answers for each A, B, C, and D, one was the correct answer and the rest were the distracters. The scoring system was that the load of each correct answer was 1 points. Thus, if one participant answered all the items correctly, she got 100 points 20X 5.

3.11 Scoring System

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