How can I use the Difficulty and Discrimination reports in the gradebook?
Scroll down to the point where you see Difficulty and Discrimination. Click on the word Difficulty to sort questions by difficulty percentage.
As you hover with your mouse over one of the bars for the question, you'll see the number of students who've answered the question, and the percentage of students who got it right and wrong. Green represents correct, and red represents incorrect.
You can also Click on the + symbol to see the percentage of students who selected each answer option.
Click on the word Discrimination. Discrimination is calculated as the correlation between how well the student answered the question and how well the student did on the assessment. Hovering over one of the bars displays a correlation score.
The discrimination score that instructors desire is .2 or above. The closer it gets to 1 the better the question correlates to the whole assignment. This analysis is called "discrimination analysis" and it is a scientific method for indicating student performance on a particular item as compared to student performance on the assessment as a whole. A negative correlation or low correlation is undesirable because it means performance on the question was not consistent with performance on the assessment as a whole.