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Henrikka,

In my mind, what to do with the 1111 guesses because it "guarantees" a 25% correct in a non-issue.  If you don't allow partial credit on the individual test, students will choose one of the four options and there's a 25% chance that a random guess will give them the same score as if they were 100% sure of the correct answer (i.e., the same result as 1111).  The difference is that with a 1111, you (and they) know that they are guessing as to what the correct answer is.

Larry
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Larry K. Michaelsen
Professor of Management
University of Central Missouri
Dockery 400G
Warrensburg, MO 64093

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>>> Henriikka Clarkeburn <[log in to unmask]> 07/06/10 1:03 AM >>>
Hi,

I am wondering if there are any success stories and technical tips from anyone on the list for using partial credit I-RATs.

We are in Sydney planning on using a 'wager' style I-RAT (on Larry's encouragement!) where for every 4-option question the students can use four lines (questions 1-4 / 5-8 etc.) on the Scantron form. If the correct answer is A and student is certain of that, she would fill in A for all four lines. If on the other hand she thinks it could be A or B she would fill in A for first two and B for the next two or one line for A and three for B etc. This way we are able to give students partial credits in a multiple choice question and get more sophisticated data on where student thinking goes wrong.

Now we have technical challenges:

1)       To be able to share with students the data in a sensible format, we wonder if anyone who uses Datalink has been able to aggregate answers for every set of four questions and present the data as % of As in these four questions, % of Bs in these four questions etc.?
2)       What is done with students who choose one of each option i.e. guessing completely and would end up guaranteed with 25% of the mark for knowing nothing?
3)       How have people weighted the different options - giving more when a student has put all their choices on one option, or just plain 25% for each line?

Looking forward to your feedback and guidance.

Best Wishes,

Henriikka
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Henriikka Clarkeburn | Lecturer
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