Hi,
There is only one choice correct in Q6 and still it is an MCQ. Due to that confusion, I got Q6 wrong, although I tried bigger values of ‘alpha’ in code and then plotted the weights.
Therefore it is requested to put “radio buttons” instead of “Check boxes” for the choices.
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We decided to use the wording Select all answers that apply to imply that there could be one or several possible answers. We kept the check boxes in this an other questions with a single correct answer whenever we thought the question may need some extra reasoning. This has the happy side effect that students get two opportunities to submit their answer.