The Proportion of Responses That Are Expected to Be Correct

question 31

Multiple Choice

The proportion of responses that are expected to be correct for each level of ability can be represented by

• A)an item characteristic curve.
• B)a discrimination index.
• C)a test characteristic curve.
• D)the optimum difficulty.

---

Definitions:

Myelinated axons

Nerve fibers covered in myelin, a protective sheath that speeds up the transmission of electrical signals in the nervous system.

White matter

Tissue in the brain and spinal cord made up primarily of nerve fibers and is responsible for communication between different brain regions and between the brain and the spinal cord.

Neurotransmitter

A chemical within the vesicles of the synaptic knob that is released into the postsynaptic structures when a nerve impulse reaches the synaptic knob.

Synaptic knob

The expanded region at the end of an axon terminal, where neurotransmitters are released to communicate with other neurons or muscle cells.