MultipleSelectProblems
Multiple Select Problems (or Checkbox Multiple Choice or Select All That Apply)
This code snippet shows the essential PG code to include multiple select question (or checkbox multiple choice or select all that apply) in a problem. A multiple choice question has only one correct answer, whereas a checkbox multiple choice question may require several items to be selected at the same time to be correct.
Note that in this example we use old-style checkbox multiple choice answer objects. The new-style MathObjects do not yet have a checkbox multiple choice answer object yet.
PG problem file | Explanation |
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DOCUMENT(); loadMacros( "PG.pl", "PGbasicmacros.pl", "PGchoicemacros.pl", "PGanswermacros.pl", "PGcourse.pl", ); TEXT(beginproblem()); |
Initialization: We must load |
$cmc = new_checkbox_multiple_choice(); $cmc -> qa ( "Select all expressions that are equivalent to " . "\( e^{x^2 + 1/x} \). There may be more than " . "one correct answer.", "\( e^{x^2} e^{1/x} \)", "\( e^{x^2} e^{x^{-1}} \)", "\( e^{ (x^3+1) / x } \)", ); $cmc -> extra( "\( \displaystyle \frac{ e^{x^2} }{ e^x } \)$BR", "\( e^{x^2} + e^{1/x} \)", ); # The next line can be uncommented. # $cmc->makeLast("All of the above"); |
Setup:
Create a new checkbox multiple choice object named
Use
Incorrect answers are specified as a list of arguments to the
To force an answer (either a new extra answer, or the correct answer) to appear last in the list of options, use the $cmc->qa("question","None of the above");</code> $cmc->extra("very wrong 1","distractor 2","red herring 3"); $cmc->makeLast("None of the above");
To force answers to appear in a certain order (like Yes followed by No), use only @quest = ("question 1","question 2"); @ans = ("Yes","No"); $pick = random(0,1,1); $cmc->new_checkbox_multiple_choice(); $cmc->qa($quest[$pick],$ans[$pick]); $cmc->makeLast("Yes","No"); |
BEGIN_TEXT This is a place to insert additional text if you wish. $PAR \{ $cmc -> print_q() \} $PAR \{ $cmc -> print_a() \} END_TEXT |
Main Text: Print the question and answers. Print the question text using |
install_problem_grader(~~&std_problem_grader); $showPartialCorrectAnswers = 0; ANS(checkbox_cmp($cmc->correct_ans)); ENDDOCUMENT(); |
Answer Evaluation: Grade the problem with |