Difference between revisions of "WeightedGrader"
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| − | <em> |
+ | <em>Standard Problem Grader: give full credit if all answers are correct and zero credit if some answers are incorrect. |
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credit only if all answers are correct, and zero credit otherwise. We should |
credit only if all answers are correct, and zero credit otherwise. We should |
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probably also hide feedback on whether answers are partially correct or |
probably also hide feedback on whether answers are partially correct or |
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| − | not. This problem grader is recommended for true / false and multiple choice |
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| + | not by setting <code>$showPartialCorrectAnswers=0;</code>. |
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| + | The standard problem grader is recommended for true / false and multiple choice |
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questions to prevent students from guessing and receiving either feedback or |
questions to prevent students from guessing and receiving either feedback or |
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partial credit that tells them whether their guess was correct. |
partial credit that tells them whether their guess was correct. |
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<p style="background-color:#eeeeee;border:black solid 1px;padding:3px;"> |
<p style="background-color:#eeeeee;border:black solid 1px;padding:3px;"> |
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| − | <em> |
+ | <em>Weighted Grader: assign different weights (percentages) to each answer in a problem. |
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Revision as of 17:22, 7 November 2009
Weighted Graders
Standard Problem Grader: give full credit if all answers are correct and zero credit if some answers are incorrect.
| PG problem file | Explanation |
|---|---|
loadMacros("PGanswermacros.pl");
# usual initialization, setup, and main text go here
# Answer evaluation
install_problem_grader(~~&std_problem_grader);
$showPartialCorrectAnswers = 0;
ANS($a->cmp());
ANS($b->cmp());
ANS($c->cmp());
|
Answer Evaluation: Be sure to load |
Weighted Grader: assign different weights (percentages) to each answer in a problem.
| PG problem file | Explanation |
|---|---|
DOCUMENT(); loadMacros( "PGstandard.pl", "PGcourse.pl", "MathObjects.pl", "weightedGrader.pl", ); install_weighted_grader(); TEXT(beginproblem); |
Initialization: We need to include the |
Context("Numeric");
Context()->variables->add(t=>"Real");
Context()->strings->add(A=>{},B=>{});
$r = random(2,4,1);
$answer1 = Real("pi * $r**2");
$answer2 = Formula("($r - 1) * x**2 * t") -> reduce;
$answer3 = String("A");
|
Set-up: To show how this works with MathObjects, we add some variables and strings to the context. |
Context()->texStrings;
BEGIN_TEXT
Enter \( \pi $r^2 \): \{ans_rule(10)\}
Enter \( $answer2 \): \{ans_rule(10)\}
Enter A: \{ans_rule(10)\}
END_TEXT
Context()->normalStrings;
|
Main Text: Answer boxes are as usual. |
$showPartialCorrectAnswers = 0; WEIGHTED_ANS( ($answer1)->cmp(), 40 ); WEIGHTED_ANS( ($answer2)->cmp(), 40 ); WEIGHTED_ANS( ($answer3)->cmp(), 20 ); ENDDOCUMENT(); |
Answer Evaluation: Use |
