COP 3502 – Summer 2011 – Exam 2 Solutions (with Instructor comments)
Exam 1 Comments:
As discussed, Exam 2 material, for the most part, is mostly regurgitation.
Ideally, this
should translate to a very high average if students put forth the effort in simply practicing
said problems.
To offset this, and to address the possibility of students having old exams, I
intentionally made (or so I thought) a couple of questions harder than normal.
Result:
didn’t matter!
The average was still WAAAY high:
90.4!
I digress; perhaps you,
as a group, are just that much “better” than in previous semesters.
Statistics:
# of Exams Taken:
130
Time Stats:
1
st
student finished at the 20 minute mark
25 students finished with 15 minutes remaining (about 1/5 of class)
35 students finished with 10 minutes remaining (about 1/4 of class)
Average Grade:
90.4 (which is a CRAZY HIGH average)
# of Perfect Grades:
12
# of Grades >= 100:
33
# of Grades >= 90:
82
# of Grades >= 80:
107
So out of 130 students, 1/4 you got a 100 or better!
Again, that’s crazy.
To be honest, that
is a problem.
I know students don’t like to hear that, but such a high score must have an
explanation:
1.
Exam was too easy.?.
I think the difficulty was perfect.
The BST question was one of the harder ones and the
“mystery” function question is a good one as well.
2.
Too much regurgitation and not enough “thinking” questions.?.
T
his is the reality of Exam 2, and, unfortunately, being a reality, it probably won’t
change much.
EVERY Exam 2 will have Recurrence Relations, Infix/Postfix, Tree
Traversals, and Sorting questions.
Those are all standard affair, and the reality of said
questions is that they are mere regurgitation for the student that prepared adequately.
3.
Old exams being studied from.?.
Maybe. But that is NOT a problem, just as studying from Foundation Exams (which I
recommend) is not a problem.
4.
Instructor is too awesome!
Given.
5.
Students are that much more awesome!
Perhaps this is part of the winning explanation.?.
Finally, regarding the length, again, I think it was fair, and, frankly, the average grade
proves as much.
Now to the solutions…

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