The optimal difficulty level for items is usually about halfway between 100% of the respondents getting the item correct and
A)a 50/50 chance for choosing a correct response.
B)the level of success expected by chance alone.
C)the highest possible variance in correct responses for the item set.
D)zero respondents getting the item correct.

Question

Quizplus · Accepted Answer

The optimal difficulty level for test items is typically set at the point where the probability of a correct response is halfway between perfect success and the success rate expected by chance, maximizing the item's ability to discriminate between different levels of ability.

The Optimal Difficulty Level for Items Is Usually About Halfway