Is it possible for an item to have acceptable item difficulty and not have accep
ID: 2949769 • Letter: I
Question
Is it possible for an item to have acceptable item difficulty and not have acceptable item discrimination? If so, how? Is it possible for an item to have acceptable item difficulty and not have acceptable item discrimination? If so, how? TABLE 6.5 Example of Item Analysis for Multiple-Choice Test 60 students completed the test Groups of 27% (16 test scores in each group); correct responses in bold print Item Responses 50 .63 13 Upper group Lower group 12 Upper group Lower group Upper group Lower group Upper group Lower group 10 47 Upper group Lower group .25 .38 Item 1. All responses considered, difficulty and discrimination good. Retain item. Item 2. All responses considered; difficulty and discrimination good. Retain item. ltem 3. Response C not considered and A considered only once; no discrimination. Reject item. ltem 4. Response D not considered; difficulty and discrimination acceptable. Retain item but replace D. Item 5. All responses considered; difficulty and discrimination marginal. Revise itemExplanation / Answer
It is possible for an item to have acceptable item difficulty and not have acceptable item discrimination.
Because,
Item difficulty is simply the percentage of students taking the test who answered the item correctly. The larger the percentage getting an item right, the easier the item.
Item Discrimination, the method of extreme groups can be applied to compute a very simple measure of the discriminating power of a test item.
According to Baker in "The basics of item response theory"
item discrimination is classified as
none 0
very low 0.01 - 0.34
Low 0.35 - 0.64
moderate 0.65 - 1.34
High 1.35 - 1.69
Very high > 1.70
Perfect + infinity
According to Baker,Hambleton (Fundamentals of Item Response Theory ), and Hasmy item difficulty is classified as :
very easy above [-2,...]
easy (-0.5,-2)
medium [-0.5,0.5]
hard (0.5,2)
very hard [2,..]
So, It is possible for an item to have acceptable item difficulty and not have acceptable item discrimination.
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