Thanks for the response Helen.
Maybe I'm confusing things I tried here, but I'm pretty sure when I tried that the quiz doesn't get graded.
If I'm wrong, then that might be a useful suggestion, however my question really is about the gradebook setup and why it is that we cannot choose to hide a quiz from the gradebook like we can with assignments and lessons? It doesn't seem to make sense that quizzes don't have the ability to be hidden from the gradebook setup.
Aside, I have come up with a workaround, if I create a category with grade type of none and move the quiz into that category. I can then go into the gradebook setup and then choose to hide the category....but I shouldn't have to go to such lengths