Choosing Answers
Students need the option "I don't know" to choose when the they do not know the answer. If a student chooses a random answer, they have the chance of "guessing" the correct one. This can result in skewed data.
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Jessica Geraci commented
Students should have an "I don't know button" so that we can clearly articulate between concepts they tried but do not understand and concepts they were aware they did not understand. I do not want false correct answers influencing the data.