Exam 2 Graded
Student
Lorena Piegas
Total Points
pts
, Question 1
1 pts
+ 20 pts Everything correct and work shown
+ 8 pts Part (a) - correct and sufficient work shown
+ 12 pts Part (b) - correct and work shown
Part (a) - partial credit
+ 7 pts Part (a) - arithmetic mistake, correct otherwise
+ 6 pts Part (a) - sign mistake in formula or mistake in computing the 2x2's, correct otherwise
+ 5 pts Part (a) - missing term in sum, but other terms correct
+ 4 pts Part (a) - significant mistake in formula used, but some correct terms
+ 4 pts Part (a) - correct value found, some apparent work shown but insufficient for reasonable calculation
+ 3 pts Part (a) - incorrect value found, with insufficient work shown to determine correctness of formula, but
some relevant calculations apparent
+ 2 pts Part (a) - some relevant calculations, but no value found
+ 1 pt Part (a) - some general reference to determinant, no progress
+ 0 pts Part (a) - blank or totally incorrect
Part (b) - partial credit
+ 11 pts Part (b) - minor arithmetic mistake, correct otherwise
+ 10 pts Part (b) - multiple arithmetic mistakes, correct otherwise
+ 9 pts Part (b) - correct strategy (i.e. Gauss-Jordan elimination or using adjugate matrix), but flawed application -
for example, malformed row operations or cofactors
+ 8 pts Part (b) - partially correct strategy (e.g. only bringing A to row echelon form not RREF, but technical steps
(e.g. row operations) are made without further mistakes
+ 6 pts Part (b) - some work shown but insufficient for final correct answer
+ 6 pts Part (b) - partially correct strategy (e.g. only bringing A to row echelon form not RREF, but technical steps
(e.g. row operations) are made with some mistakes
+ 4 pts Part (b) - some work shown but insufficient for final answer (incorrect)
+ 4 pts Part (b) - some valid initial setup (e.g. [A∣I ], but little progress and insufficient to assess any conclusions
taken from work
+ 2 pts Part (b) - some relevant calculations, but no meaningful progress
+ 0 pts Part (b) - blank, totally incorrect or no work shown
Student
Lorena Piegas
Total Points
pts
, Question 1
1 pts
+ 20 pts Everything correct and work shown
+ 8 pts Part (a) - correct and sufficient work shown
+ 12 pts Part (b) - correct and work shown
Part (a) - partial credit
+ 7 pts Part (a) - arithmetic mistake, correct otherwise
+ 6 pts Part (a) - sign mistake in formula or mistake in computing the 2x2's, correct otherwise
+ 5 pts Part (a) - missing term in sum, but other terms correct
+ 4 pts Part (a) - significant mistake in formula used, but some correct terms
+ 4 pts Part (a) - correct value found, some apparent work shown but insufficient for reasonable calculation
+ 3 pts Part (a) - incorrect value found, with insufficient work shown to determine correctness of formula, but
some relevant calculations apparent
+ 2 pts Part (a) - some relevant calculations, but no value found
+ 1 pt Part (a) - some general reference to determinant, no progress
+ 0 pts Part (a) - blank or totally incorrect
Part (b) - partial credit
+ 11 pts Part (b) - minor arithmetic mistake, correct otherwise
+ 10 pts Part (b) - multiple arithmetic mistakes, correct otherwise
+ 9 pts Part (b) - correct strategy (i.e. Gauss-Jordan elimination or using adjugate matrix), but flawed application -
for example, malformed row operations or cofactors
+ 8 pts Part (b) - partially correct strategy (e.g. only bringing A to row echelon form not RREF, but technical steps
(e.g. row operations) are made without further mistakes
+ 6 pts Part (b) - some work shown but insufficient for final correct answer
+ 6 pts Part (b) - partially correct strategy (e.g. only bringing A to row echelon form not RREF, but technical steps
(e.g. row operations) are made with some mistakes
+ 4 pts Part (b) - some work shown but insufficient for final answer (incorrect)
+ 4 pts Part (b) - some valid initial setup (e.g. [A∣I ], but little progress and insufficient to assess any conclusions
taken from work
+ 2 pts Part (b) - some relevant calculations, but no meaningful progress
+ 0 pts Part (b) - blank, totally incorrect or no work shown
