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Assume That of 55 Persons Who Take a Test, 10

Question 34

Multiple Choice

Assume that of 55 persons who take a test, 10 of the 15 people falling in the upper group on total test score and 5 of the 15 falling in the lower group on total test score pass a given item. What is the item difficulty index?


A) .17
B) .33
C) .50
D) 1.00

Correct Answer:

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