Assume that, for a given item, U = L = 10 and 80% of the examinees in the upper group but only
30% of those in the lower group get the item right. Then
A) p = .45, D = .60. B) p = 1.10, D = .25.
C) p = .55, D = -.50. D) p = .55, D = .50.
D
Psychology
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