Level of Difficulty Construct Validity
32
Point biser D discrimination power
D 0.199 Very low
0.200 – 0.299
Low 0.300
– 0.399 Average
D 0.400 High
Prop. Endorsing the quality of options
0.000 – 0.010
Low 0.011
– 0.050 Sufficient
0.051 – 1.000
Good Alpha reliability
0.000 – 0.400
Low 0.401
– 0.700 Average
0.701 – 1.000
High To make easier in choosing item test which need to be revised or dropped,
recommended by using the following criteria:
Table 2. The criteria to classify the quality of the test items Criteria
Indeks Classification
Interpretation
Prop. correct p level of
difficulty 0.000
– 0.099 Very difficult Dropneeds total
revising 0.100
– 0.299 Difficult Needs revising
0.300 – 0.700 Average
Good 0.701
– 0.900 Easy Needs revising
0.901 – 1.000 Very easy
Dropneeds total revising
Point biser D discrimination
power D 0.199
Very low Dropneeds total
revising 0.200
– 0.299 Low Needs revising
0.300 – 0.399 Quite average Without revision
D 0.400 High
Very good Prop. Endorsing
the quality of options
0.000 – 0.010 Least
Dropneeds revising 0.011
– 0.050 Sufficient Good enough
0.051 – 1.000 Good
Very good Alpha
Reliability 0.000
– 0.400 Low Not sufficient
0.401 – 0.700 Average
Sufficient 0.701
– 1.000 High Good
33