Author Question: When calculating an item discrimination index for a test, you notice that one of your items yields a ... (Read 135 times)

theo · **on:** Jul 31, 2018

When calculating an item discrimination index for a test, you notice that one of your items yields a value of +1.00. What can be inferred from this value?

a. Both high and low test scorers answered this item correctly
b. The item is relatively easy
c. High test scorers answered this correctly and those with low scores answered it incorrectly
d. The item is relatively difficulty

Question 2

When calculating item difficulty, you find that a particular item yields a value of .85. What can be inferred from this value?

a. Item is relatively easy
b. 85 of students missed this item
c. Item is relatively difficult
d. 15 of students got this item correct