In the quiz module for multiple choice questions I wanted to set it that wrong answers are subtracted from the right answers. Is that not the reason for the negative %?
If a set a question as 100% for the right answer and -100% for the wrong answer, it does not give a -100% if you give a wrong answer.
Could you please explain the reason?
Anytime a total score adds up to under zero, it is stored as zero.
The idea of the negative score is to reduce a score. For example, in your example, answering both of those answers would result in zero. You are saying: you get full marks if you think *THIS* is right, but I'll take away all the marks if you also think *THAT* is right. The idea is to stop students just checking every box.
If questions are negative then you have to deal with the possibility that whole quizzes can be negative. Is this something you need?
Thanks Martin, that makes it clear.
This is not clear to me either.
If I have 4 possible answers in a multiple choice question, and only one is correct, I set the corect answer to 100%, but what are the settings for each wrong question?
One way to think of it is: for each answer, how right is it?
If an answer was only half right then you might make it 50%, so that they still get some credit even if they didn't pick the best answer.
It's a very flexible system once you get used to it, but I can see the need for some better documentation there.