The answer to your question is yes, you can use it to do predictions. But obviously it was not created with that in mind.
In the _quiz_statistics table everyone's answer is recorded (I originally did this as part of a statistics module). It would not be difficult to write a script (I could help you with this) which would output the answers users selected, I don't imagine it would be too hard to have it cross-reference the list of correct answers you specify.





