Question: Obtain the test characteristic curve for a test with ten items using the following item difficulty parameters: b1 D 3:0 b2 D 2:5 b3 D

Obtain the test characteristic curve for a test with ten items using the following item difficulty parameters:

b1 D 3:0 b2 D 2:5 b3 D 2:0 b4 D 1:5 b5 D 1:0 b6 D 0:5 b7 D 0:0 b8 D 0:5 b9 D 1:0 b10 D 1:5 The resulting test characteristic curve has a nearly linear section from an ability level of 3 to C1. After this point it bends over slightly as it approaches a score of J. The mid true score of 5 corresponds to an ability level of 0:6.

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