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What is the difficulty (p) of item 3? QUESTION 7 What is the difficulty (p) of item 3? Option Item 1 Item 2 Item 3

What is the difficulty (p) of item 3?

QUESTION 7 What is the difficulty (p) of item 3? Option Item 1 Item 2 Item 3 (Keyed response is C) (Keyed response is B) (Keyed response is B) A 0 50 O Upper group B O 50 O (n = 100) C 90 0 O D 10 O 100 A 0 110 0 Middle group B 40 110 60 (n = 300) C 240 60 40 D 20 20 200 A 10 30 0 Lower group B 10 20 30 (n = 100) C 60 30 10 D 20 20 60

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