Question: The optimum difficulty level is between 1 0 0 % of the respondents getting the item correct and the level of success expected by alone.

The "optimum difficulty level" is between 100% of the respondents getting the item correct and the level of success expected by alone.
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All the items on the UAT have five response choices. The optimum item difficulty level for UAT items (with a precision of three decimal places) is (Note: Refer to the formula presented on text pp.173-174.)
The "optimum difficulty level" is between 100% of the respondents getting

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