Review of Items Analysis a. Definition of Items Analysis

learners who get the items correct Costagliola, 2009: 67. Level of Difficulty can be obtained by using the following formula: � = � Note: � = under number of item difficulty = amount of students who have correct answer � = total of student Anas Sudijono, 2011: 372 Criteria index the level of difficulty, that’s: 0,00-0,29 = category difficulty question 0,30-0,69 = category medium question 0,70-1,00 = category easy question Suharsimi, 2009: 210 4. Discrimination Index The formula to determine index discrimination is: � = − = � − � Note: J = amount of participant = amount of upper participant = amount of lower participant = amount of upper participant which answering true question = amount of lower participant which answering true question � = = proportion upper group participant which answering true question � = = proportion lower group participant which answering true question Interpretation of discrimination index, that’s: 0,00 –0,19 = poor 0,20 –0,39 = enough 0,40 –0,69 = good 0,70 –1,00 = very good Suharsimi, 2009: 201 The interpretation has been modified because numbers between 200 and having the same limits early so as to cause trouble in inserting category about. 5. Distractor Efficiency The answers are scattered which answers testee according to answer a, b, c, d, e choice or not at all. Distractor good will be selected by at least be elected by 5 of total testee. Knowing the percentage of the vote testee distractor using formula as: � = � � �� � ��� 100 Table 1. Scala Likert Category Interpretation Very good 1 Good 2 Enough 3 Bad 4 Very Bad The conclusioan about distractor fungsion is: a It is very good if distractor at about serves as a whole. b It is good if distractor on about not well-functioned one alternative. c It is enough if distractor on about not well-functioned two alternatives. d It is bad when distractor unable to function at about three alternatives. e It is very bad if the distractor in a question of four alternative does not work.