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Reliability Level of Difficulty Discriminating Power

3.7.2 Reliability

A question is said to be reliable when approximately the same results are obtained on different occasions. To calculate the reliability, the test in the instrument was R 11 = xy xy r xr + 1 2 In which = r 11 : Reliability index r xy : correlation of odd even value The critical value for N = 40 are 0,312. The coefficient of the correlation is higher than the critical value for t Product Formula, r xy r table. It means that the instrument was reliable.

3.7.3 Level of Difficulty

Difficulty level or item facility, according to Brown is the extension to which an item is easy or difficult for the intended group of test-takers. To calculate the reliability, the test in the instrument was tested using the formula as follows: DL = JS B DL: item of difficulty level B : number of students who answer the item correctly JS: number of students 0 P 0,3 is difficult 0.3 P 0,07 is medium 0,7 P 1 is easy Based on the result obtain, the items of reading comprehension test were considered easy, number 1, 4, 6, 9, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34, 36, 37, 39. The reading comprehension test were considered medium are 12 items, they are 2, 3, 5, 7, 8, 10, 16, 29, 30, 35, 38, 40 and no one item were considered difficult.

3.7.4 Discriminating Power

The discriminating power is used to measure how well the test items arranged to identify the differences in the students’ competence. The formula is: DL = − Ja Ba Jb Bb In which, Ba: number of students in the upper group who answer the item correctly Bb: number of students in the lower group who answer the item correctly Ja: number of all students in the upper group Jb: number of all students in the lower group Criteria: D 0,1 is poor 0,1 D 0,5 is good 0,5 D 1 is very good The result of the discrimination power of the test was considered very good are number 28, 38, 30. The medium or good items were number 1,2, 3,4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,29,30,31,32,33,34,35,36, 37,39,40 and no one item were considered difficult.

3.8 The Step in Action Research

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