These are there to give you an idea what the quiz is about and to show that all the answers are plausible. For example, all of the answers on question 1 are types of plate interaction - therefore they can all serve as distractors. The answers on question 2 are choices from several different things they learned in the unit.
I gave this quiz on Moodle. It does have some tools for analyzing scores, but not quite as nice as those illustrated in the Georgia TOOL lesson. Here is what the Moodle analytics page looks like with the student names removed. It took two screen shots to get them.
This was one of the first quizzes that I graded, so I could not coordinate these with the students overall grades. However, in hindsight, I can now. Overall the grades on this quiz coordinate nicely with the students overall grades. One student, the first one on the list, did significantly worse on the first quiz than his overall grade. I think this was because he realized he needed to change his study habits and put in extra effort. Anyway, one aberrant quiz isn't that unusual. We all have bad days.
Some of the questions were so straightforward that no one missed them. These were useless for discriminating between high and low performers. Question 11 was the best for discriminating performance - about half the students got it right and about half got it wrong.
To me, this question is as straight forward as all the others. It is a simple definition question. One student missed it because of time (did not answer). The others seemed to confuse spreading plates with a fault. This is something that I cleared up with simple feedback.
Question 12 did not coordinate well with the overall grades. Almost everyone missed the question. There were two reasons for this. First, it was a multi-part matching question. Missing any of it made the students miss it all. While this accounted for some of the low scores, I also felt that I had not emphasized the layers of the earth as much. I had taught this first in the unit and not come back to it. Also, the earth is divided into layers two different ways - by physical properties and chemical properties. This confused students. The low score on this question told me that I needed to reteach this topic.
I know that the quiz was valid because these scores coordinated fairly well with overall grades. There were legitimate distractor answers in each question. This test was fairly secure as the students had one attempt and a strict time limit. The time limit may have been a bit to short as one student did not finish, but I'd rather have that than have the students have so much time that they could just look up answers.
adfa
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