Figure 9 shows the results for quiz question 2: Which
control approach is affected more by disturbance inputs?
While most students correctly guessed that disturbance
inputs are a bigger problem for open-loop systems even
before the demonstration, there is still an increase in the
number of correct answers after the demonstration (from
quiz 1 to quiz 2). A YouTube video was also posted after
the lecture and some of the students watched the video
before the next lecture. This may explain a reduction
in the number of wrong answers between quiz 2 and