Item Total correlation can be used to make decisions about retaining or discarding an item based on how well the item discriminates between high- and low-scoring test takers
This correlation technique compares the overall assessment score and the question score. It is expected that a participant will answer a question correctly because they should, and those who answer incorrectly typically receive lower overall assessment scores.
Item Total correlation:
The item total correlation measures the relationship between a question's score (for multiple-choice questions, 0 or 1) and the overall assessment score (in this case, 67%). It is anticipated that participants who correctly answer a question will often receive higher overall evaluation scores than those who incorrectly answer a question. A key cautionary sign when examining an item-total correlation is often negative results. For instance, it would be unrealistic to expect individuals who perform poorly on the questions to perform well on the assessment. This could mean that the question was phrased incorrectly or that it was extremely vague and difficult for participants to understand.
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