Making an entire quiz worth extra credit isn't easy in Canvas if you are using a Points based gradebook. The following directions explain how to make this happen:

• Create a quiz
• Provide point values for each question. (making the quiz worth "X" amount of points - the total number of points the extra credit should be worth.)
• Publish the quiz and have the students take it.
• Once all students have taken a quiz and received a score, which is recorded in the gradebook.
• Edit the Quiz and change the Quiz type to a Graded Survey worth "0" points.
• The student will then receive whatever extra credit value they earned.

IMPORTANT: When copying the course it will copy it as a survey - so be sure to Edit and revert it back to a graded quiz for the next term!!

Hope this helps!