I wrote a test which was too hard. I do not want to use the Canvas redistribution method because my scores are not distributed equally across the range; and I cannot add an equal number of fudge points because I do have some scores near 100%. The method that would make the most sense to adjust for this test is the square root method.
I think the best way to see how it works is to run the numbers on one of your own tests; here's a sample of resulting scores from mine.
|Raw Score||Curved Score|
Also, for instructors new to or hesitant about curving, the results of curving should be available as a preview before finalizing, or possible to undo. Please search "Preview or undo for curving grades" to view and vote on this related feature request.