Evaluation of student responses
The student value is determined from the student's submitted answer to a solutionDiagramGraph problem as follows:
| Parameter | Student Value |
|---|---|
| Parabola Fit | R-square statistic resulting from fitting the function y-y_0 = A*(x-x_0)^2 to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd) |
| Parabola Concavity | Parameter "A" resulting from fitting the function y-y_0 = A*(x-x_0)^2 to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| parabolaX Vertex | Parameter "x_0" resulting from fitting the function y-y_0 = A*(x-x_0)^2 to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| parabolaY Vertex | Parameter "y_0" resulting from fitting the function y-y_0 = A*(x-x_0)^2 to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| Line Fit | R-square statistic resulting from fitting the function y = m*x+b to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| Line Slope | Parameter "m" resulting from fitting the function y = m*x+b to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| Line Angle | Parameter "arctan(m)" resulting from fitting the function y = m*x+b to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| lineY, Intercept | Parameter "b" resulting from fitting the function y = m*x+b to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| constantFit | R-square statistic resulting from fitting the function y = b to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
| constantValue | Parameter "b" resulting from fitting the function y = b to the plot labeled label in the student's submitted answer over the range (rangeBegin,rangeEnd). |
The specified parameter is derived from the student-submitted plots by fitting a line or parabola over the range of x-values between rangeBegin, rangeEnd. The value is then compared to the author value, which is determined as follows:
- If the type is "match," the author value is determined in the same way as the student value, except that the contents of the graphs field is used in place of the student's submitted answer.
- Otherwise, the author value is the contents of the value field.
See also:
Entering solutionDiagramGraph answers
Adding alternate correct answers