b. Reliability of the test obviously have been including the high
unreliable if r
11
less smaller than 0,70. Anas Sudijono, 2009: 209
3. The Level of Difficulty
The level of the difficulty is the measurement of how big degree the lurch a difference. If the question having a level of the difficulty balanced, it
can be said that the question is good. The level of the difficulty is usually describe with an index the difficulty. Index of item can be obtained by
using the following formula: � = �
Note: � = point of difficulty item
= amount of testee which true answering with this item � = amount testee which following the result of study
Anas Sudijono, 2009: 372 According to Suharsimi, 2009: 210, 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
The interpretation has been modified because number in Suharsimi’
book between and the under limit and top limit having the same number, so makes a trouble in inserting category of question.
4. Discrimination Index
Discrimination index an analysis used to know about the ability of item to be able to distinguish between student who has mastered of
materials, with the student who has not been the materials. The higher coefficient discrimination index the item of question, the more capable of
item differentate between the student who have control of competence with the student who has not been or less to take control of the
competency. 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 number in Suharsimi’s
book between the lower limit and upper limit having the same number, so makes a trouble in inserting category of question.
5. Distractor Efficiency
Distractor efficiency used to know distractor functioning properly or not. The distractor efficiency is testee distribution to specify the answers
form multiple choise. The distributions answer will be know by the
