D. Degree of difficulty
Figs. 4 and 5 show the degree of difficulty of the questions
by showing the number of topics covered in high-order and
low-order questions, by university. It is clear that university
#1 is the one that uses more HOqs. Moreover, it is also the
university that uses more topics per question. However, this is
the university that teaches the I/O topic in the 4th semester,
and it would therefore be expected to use questions of a higher
degree of difficulty.