Can I change the answer key to a quiz once students have taken it? I revised a quiz for a retake and forgot to change one of the possible answers. I want to make sure I'm not "undoing" the quiz!
yes you can. you'll then be prompted for how to deal with the questions that have changed - whether to regrade them, or give the students full points regardless of answer.
To add to Anthony's post, here is the guide that shows the options for regrading a quiz: What options can I use to regrade a quiz in a course?
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