What Is the Value of the Item-Discrimination Index for an Item

question 16

Multiple Choice

What is the value of the item-discrimination index for an item that all the students in the higher-scoring group answered correctly but that no one in the lower-scoring group answered correctly?

• A) -1
• B) +1
• C) .50
• D) .25

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Definitions:

Income Responsiveness

The degree to which demand for a product or service changes in response to changes in consumer income.

Income Elasticity of Demand

A metric that gauges the sensitivity of demand for a product to shifts in the income of consumers.

Weekly Income

The total amount of earnings received by an individual or entity over the span of a week.

Bars of Chocolate

Solid blocks of chocolate that can vary in cocoa content, sweetness, and added ingredients, enjoyed as confectionary treats.