This article will explain how students are graded on a Confidence-Based IRAT.
Larry Michelsen's confidence based testing method is an interesting approach to use on IRAT activities. But sometimes there can be a bit of confusion between grading points and confidence based points.
" I was given the option of setting a point value for the questions on the iRAT, and I chose 5 points each (because that meant that the total was a nice round number). However, when students took the actual quiz and did point spreading it only gave them 4 points to use. I'm not really clear how grades are then calculated if, for example, a student put 2 points on the right answer. Do they get 2 points? Or do they get 50% of 5 (2.5 points)?"
In essence, the points to be allocated are not mutually tied to the points set as the grading criteria. The confidence-based points are just an answer selection tool, and the points available are tied to the number of answers available in that specific question.
So a question with 4 answers will give the students 4 points to allocate. Here 2 confidence points will equal 2.5 points in the grading scale, and the answer will reflect a 50% confidence level. So, 1 point will reflect a 1.25 or 25% confidence level, and so on.
If your question only has 2 answers, then the students will only have 2 points to allocate, and the process is replicated.