Elementary Math Models -- Fall 2017
Results for Exam 3
This webpage will give an overview of how the class performed as a
whole on the exam. You can find your individual score posted on Blackboard. When you
get the exam back in class, double check that the score on your paper
is the same as what is recorded on blackboard. Also, add up your
points for the entire exam and double check that I have the right total
for your paper. I am very careful totalling and recording scores,
but mistakes CAN occur.
Class Performance. The first histogram below shows all of
scores for the third exam. The scores are rounded (up) to the
nearest whole number, so if you got an 86.5 that would appear as an 87
on the graph. The graph shows 12 scores of 92, and
another 5 in the range from 87 to 89. So about 60% of the
scored at 87 or above. The second
histogram shows each
student's exam average for the three exams we have completed.
About 3/4 of the students are still on track to
B or better
in the course at this point.
However, I am a bit concerned that several students have seen a steady
decline in their exam scores. Part of this may reflect increasing
difficulty of the material. But judging from the results on the
exam, it appears that some students who did well at the start of the
course were not fully prepared for this exam. I suspect that some
students have not been keeping up with homework, and have been coasting
for the last few weeks. If you are such a student, and if your
exam average has fallen below 80, I strongly urge you to
rededicate yourself to doing the assignments. With a poor showing
on the final exam you could end up with an unsatisfactory course grade.
Part I Multiple
For each item the instructions
said to circle ALL correct statements, and more than one correct
appears for several of the items.
Accordingly, each statement of each item was scored as if it
were a T/F
question, with a total of 36 such questions. I
assigned one “x” for each
true statement that was not
circled, and for each false statement that was circled. Your raw score for part I is 36 minus the
of x’s. This was converted to an adjusted score in
the range from 0 to 27 by proportional reasoning. We know that a
raw score of 0 should give an adjusted score also equal to 0, and a raw
score of 36 should give an adjusted score of 27. Using
proportional reasoning, each point of the raw score corresponds to 3/4
of a point for the adjusted score. Therefore, the adjusted score
equals the raw score times .75. That result was then rounded up to the nearest half point.
For example, if you
had 5x's, your raw score was 31 and your adjusted score would be
(31)(.75) = 23.25. Rounding (up) to the nearest half point gives
paper indicates the number of x’s for each
numbered problem, but does not tell you which statements were correct
incorrect. This is intentional: Your
Exam Solutions groups will need to discuss the multiple choice items
to some consensus about which statements are true, and why.
Part II Problem 3
Each part a
through f was scored on a
scale of 0 to 10. This gives a maximum possible raw score of
60. The raw score was multiplied by 21/60 and then rounded to the
nearest half point. For example, a raw score of 52 would produce
an adjusted score of 52(21/60) = 18.2, which is 18 to the nearest half
point. Adjusted scores ending in .25 or .75 were rounded up to the nearest half point.