Difference between revisions of "MultipleSelectProblems"
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+ | {{historical}} |
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+ | <p style="font-size: 120%;font-weight:bold">This problem has been replaced with [https://openwebwork.github.io/pg-docs/sample-problems/Misc/MultipleChoiceCheckbox.html a newer version of this problem]</p> |
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+ | |||
<h2>Multiple Select Problems (or Checkbox Multiple Choice or Select All That Apply)</h2> |
<h2>Multiple Select Problems (or Checkbox Multiple Choice or Select All That Apply)</h2> |
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<p> |
<p> |
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− | 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 |
+ | 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. |
</p> |
</p> |
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loadMacros( |
loadMacros( |
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− | " |
+ | "PGstandard.pl", |
− | "PGbasicmacros.pl", |
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"PGchoicemacros.pl", |
"PGchoicemacros.pl", |
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− | "PGanswermacros.pl", |
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"PGcourse.pl", |
"PGcourse.pl", |
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); |
); |
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<td style="background-color:#ffffdd;border:black 1px dashed;"> |
<td style="background-color:#ffffdd;border:black 1px dashed;"> |
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<pre> |
<pre> |
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− | $ |
+ | $mc = new_checkbox_multiple_choice(); |
− | $ |
+ | $mc -> qa ( |
− | "Select all expressions that are equivalent to |
+ | "Select all expressions that are equivalent to |
− | + | \( e^{x^2 + 1/x} \). There may be more than |
|
− | + | one correct answer.", |
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− | "\( e^{x^2} e^{1/x} \)", |
+ | "\( e^{x^2} e^{1/x} \)$BR", |
− | "\( e^{x^2} e^{x^{-1}} \)", |
+ | "\( e^{x^2} e^{x^{-1}} \)$BR", |
− | "\( e^{ (x^3+1) / x } \)", |
+ | "\( e^{ (x^3+1) / x } \)$BR", |
); |
); |
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− | $ |
+ | $mc -> extra( |
"\( \displaystyle \frac{ e^{x^2} }{ e^x } \)$BR", |
"\( \displaystyle \frac{ e^{x^2} }{ e^x } \)$BR", |
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− | "\( e^{x^2} + e^{1/x} \)", |
+ | "\( e^{x^2} + e^{1/x} \)$BR", |
); |
); |
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− | # The next line can be uncommented. |
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+ | $mc -> makeLast("None of the above"); |
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− | # $cmc->makeLast("All of the above"); |
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</pre> |
</pre> |
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</td> |
</td> |
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<p> |
<p> |
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<b>Setup:</b> |
<b>Setup:</b> |
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− | Create a new checkbox multiple choice object named <code>$ |
+ | Create a new checkbox multiple choice object named <code>$mc</code> with <code>$mc->new_checkbox_multiple_choice();</code>. |
</p> |
</p> |
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<p> |
<p> |
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− | Use <code>$ |
+ | Use the question and answer method <code>qa( )</code> to store the question string and correct answer strings in <code>$mc</code>. For example, <code>$mc->qa("question","correct answer 1","correct answer 2");</code>. Note that unlike match lists and select lists, you cannot call the <code>qa( )</code> method again. If you include math symbols you should switch to LaTeX mode |
+ | <code CLASS="tex2math_ignore">\( \)</code>, and use <code>\displaystyle</code> with extra spacing <code>$BR</code> after each entry, if necessary. For example, <code CLASS="tex2math_ignore">$mc->qa("question", "\( x^2 \) $BR", "\( \displaystyle \frac{x^2}{4-x} \) $BR" );</code> |
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</p> |
</p> |
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<p> |
<p> |
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− | Incorrect answers are specified as a list of arguments to the <code>extra</code> method. |
+ | Incorrect answers are specified as a list of string arguments to the <code>extra( )</code> method. |
</p> |
</p> |
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<p> |
<p> |
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− | + | The arguments of the <code>makeLast( )</code> method will appear at the end of the list and will not be shuffled, unlike the arguments of <code>extra( )</code>, which are shuffled. The arguments to <code>makeLast( )</code> can either be a new extra answers or only the correct answer. For example, if the only correct answer is "None of the above", use |
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<pre> |
<pre> |
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− | $ |
+ | $mc->qa("question","None of the above"); |
− | $ |
+ | $mc->extra("very wrong","distractor","red herring"); |
− | $ |
+ | $mc->makeLast("None of the above"); |
</pre> |
</pre> |
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</p> |
</p> |
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<p> |
<p> |
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− | To |
+ | To make answers appear in a certain order (e.g., Yes followed by No and Maybe), use <code>$mc->qa("question","Yes"); $mc->makeLast("Yes","No","Maybe");</code> and do not use <code>extra( )</code> at all. In this case, to randomize the question and answer, where the answer to question 1 is Yes and the answer to question 2 is No, use |
<pre> |
<pre> |
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@quest = ("question 1","question 2"); |
@quest = ("question 1","question 2"); |
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@ans = ("Yes","No"); |
@ans = ("Yes","No"); |
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$pick = random(0,1,1); |
$pick = random(0,1,1); |
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− | $ |
+ | $mc->new_checkbox_multiple_choice(); |
− | $ |
+ | $mc->qa($quest[$pick],$ans[$pick]); |
− | $ |
+ | $mc->makeLast("Yes","No","Maybe"); |
</pre> |
</pre> |
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</p> |
</p> |
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BEGIN_TEXT |
BEGIN_TEXT |
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− | This is a place to insert additional text if you wish. |
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+ | \{ $mc -> print_q() \} |
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− | $PAR |
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+ | $BR |
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− | \{ $ |
+ | \{ $mc -> print_a() \} |
− | + | ||
− | \{ $cmc -> print_a() \} |
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END_TEXT |
END_TEXT |
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</pre> |
</pre> |
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<td style="background-color:#ffcccc;padding:7px;"> |
<td style="background-color:#ffcccc;padding:7px;"> |
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<p> |
<p> |
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− | <b>Main Text:</b> Print the question and answers. Print the question text using <code>$ |
+ | <b>Main Text:</b> Print the question and answers. Print the question text using <code>$mc->print_q()</code> and |
− | the list of all answers using <code>$ |
+ | the list of all answers using <code>$mc->print_a()</code>. |
</p> |
</p> |
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</td> |
</td> |
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$showPartialCorrectAnswers = 0; |
$showPartialCorrectAnswers = 0; |
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− | ANS(checkbox_cmp($ |
+ | ANS( checkbox_cmp( $mc->correct_ans() ) ); |
ENDDOCUMENT(); |
ENDDOCUMENT(); |
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<b>Answer Evaluation:</b> We use the standard problem grader, an all-or-nothing grader that gives no partial credit, and set <code>$showPartialCorrectAnswers = 0;</code> to withhold credit and hide the correct answers until the student answers everything correctly. Otherwise, the student can use a guess-and-check method to find the correct answers by the partial credit and feedback received. Use the <code>checkbox_cmp</code> answer checker. |
<b>Answer Evaluation:</b> We use the standard problem grader, an all-or-nothing grader that gives no partial credit, and set <code>$showPartialCorrectAnswers = 0;</code> to withhold credit and hide the correct answers until the student answers everything correctly. Otherwise, the student can use a guess-and-check method to find the correct answers by the partial credit and feedback received. Use the <code>checkbox_cmp</code> answer checker. |
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</p> |
</p> |
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+ | <p>See |
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+ | [https://webwork.maa.org/moodle/mod/forum/discuss.php?d=4999 the linked forum discussion thread] for a technique to give partial credit on such questions.</p> |
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</td> |
</td> |
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</tr> |
</tr> |
Latest revision as of 10:36, 16 July 2023
This problem has been replaced with a newer version of this problem
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.
PG problem file | Explanation |
---|---|
DOCUMENT(); loadMacros( "PGstandard.pl", "PGchoicemacros.pl", "PGcourse.pl", ); TEXT(beginproblem()); |
Initialization: We must load |
$mc = new_checkbox_multiple_choice(); $mc -> qa ( "Select all expressions that are equivalent to \( e^{x^2 + 1/x} \). There may be more than one correct answer.", "\( e^{x^2} e^{1/x} \)$BR", "\( e^{x^2} e^{x^{-1}} \)$BR", "\( e^{ (x^3+1) / x } \)$BR", ); $mc -> extra( "\( \displaystyle \frac{ e^{x^2} }{ e^x } \)$BR", "\( e^{x^2} + e^{1/x} \)$BR", ); $mc -> makeLast("None of the above"); |
Setup:
Create a new checkbox multiple choice object named
Use the question and answer method
Incorrect answers are specified as a list of string arguments to the
The arguments of the $mc->qa("question","None of the above"); $mc->extra("very wrong","distractor","red herring"); $mc->makeLast("None of the above");
To make answers appear in a certain order (e.g., Yes followed by No and Maybe), use @quest = ("question 1","question 2"); @ans = ("Yes","No"); $pick = random(0,1,1); $mc->new_checkbox_multiple_choice(); $mc->qa($quest[$pick],$ans[$pick]); $mc->makeLast("Yes","No","Maybe"); |
BEGIN_TEXT \{ $mc -> print_q() \} $BR \{ $mc -> 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( $mc->correct_ans() ) ); ENDDOCUMENT(); |
Answer Evaluation: We use the standard problem grader, an all-or-nothing grader that gives no partial credit, and set See the linked forum discussion thread for a technique to give partial credit on such questions. |