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Students just click Submit on a Graded survey and get full points. How to I change that?

Question asked by Hao-Nhien Vu on Sep 19, 2018
Latest reply on Sep 20, 2018 by Ken Black

I have a graded survey with a multiple-choice question asking for students' gut-feeling answer to a math problem. But when students just click Submit without answering they still get full points. How do I make the graded survey give zero for non-responses?