a clarification regarding the psychometric plots in exercise 3:
I mistakenly wrote that the y-axis should be the average number of correct decisions. Instead it should have been the average number of decisions "f_1 > f_2" in each bin. Then you get an actual psychometric curve with sigmoidal shape (like in homework 7).
If you already submitted or did this exercise, you don't have to redo it (I won't subtract points, of course). But it will make more sense with this correction.
I apologize for the confusion.