Difference between revisions of "MultipleSelectProblems"

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<pre>
  
<pre>
−
# Make a new checkbox multiple choice
  
 
$cmc = new_checkbox_multiple_choice();
  
$cmc = new_checkbox_multiple_choice();
−
# $cmc now "contains" the checkbox multiple choice object.
 
−  
−
# Insert a question and matching answers in the q/a list
  
 
$cmc -> qa (
  
$cmc -> qa (
−
"Please select all expressions that are equivalent to \(e^{x^2 + 1/x}\).", # question
 +
"Select all expressions that are equivalent to " .
−
"\( e^{x^2} e^{1/x} \)", # a correct answer
 +
"\( e^{x^2 + 1/x} \). There may be more than " .
−
"\( e^{x^2} e^{x^{-1}} \)", # another correct answer
+
"one correct answer.",
−
"\( e^{ (x^3+1) / x } \)", # Use " ... " to enter a string and \( \) for math
 +
"\( e^{x^2} e^{1/x} \)",
−
# "All of the above",
 +
"\( e^{x^2} e^{x^{-1}} \)",
−
# "None of the above",
+
"\( e^{ (x^3+1) / x } \)",
 
);
  
);
−
# If the only correct answer is "All of the above"
  
−
# or "None of the above", uncomment the
 
−
# "All of the above" or "None of the above" string
 
−
# above and remove all other correct answers from the list
  
−  
−  
−
# Insert some incorrect answers
  
 
$cmc -> extra(
  
$cmc -> extra(
−
"\( e^{ (x^2+1) / x } \)",
 +
"\( \displaystyle \frac{ e^{x^2} }{ e^x } \)$BR",
−
"\( e^{x^2} e^{-x} \)",
  
−
"\( e^{x^2} e^{-x} \)",
  
−
"\( \displaystyle \frac{ e^{x^2} }{ e^x } \)",
  
 
"\( e^{x^2} + e^{1/x} \)",
  
"\( e^{x^2} + e^{1/x} \)",
−
"\( e^{x^2} + e^{-x} \)",
  
 
);
  
);
−  
 
# The next line can be uncommented.
  
# The next line can be uncommented.
 
# $cmc->makeLast("All of the above");
  
# $cmc->makeLast("All of the above");
−  
−
# Note that unlike match lists and select lists, you cannot call qa() again
  
 
</pre>
  
</pre>
 
</td>
  
</td>
 
<td style="background-color:#ffffcc;padding:7px;">
  
<td style="background-color:#ffffcc;padding:7px;">
 
<p>
  
<p>
−
Setup: Create a new checkbox multiple choice object with <code>new_checkbox_multiple_choice</code>, and then store the question and correct answer with the <code>qa</code> method. Other answers are specified as a list of arguments to the <code>extra</code> method. To force an answer (either a new extra answer, or the correct answer) to appear last in the list of options, use the <code>makeLast</code> method. All other answers will be scrambled when the multiple choice problem is shown to students.
  
  +
<b>Setup:</b>
  +
Create a new checkbox multiple choice object <code>$cmc</code>with <code>$cmc->new_checkbox_multiple_choice();</code>.
  +
</p>
  +
<p>
  +
Use <code>$cmc->qa("question","correct answer 1","correct answer 2");</code> to store the question string and correct answer strings. Note that unlike match lists and select lists, you cannot call <code>qa( )</code> again.
  +
</p>
  +
<p>
  +
Incorrect answers are specified as a list of arguments to the <code>extra</code> method.
  +
</p>
  +
<p>
  +
To force an answer (either a new extra answer, or the correct answer) to appear last in the list of options, use the <code>makeLast</code> method. All answers not in <code>makeLast()</code> will be scrambled when the multiple choice problem is shown to students. If the only correct answer is "None of the above" (or "All of the above"), use
  +
<pre>
  +
$cmc->qa("question","None of the above");</code>
  +
$cmc->extra("very wrong 1","distractor 2","red herring 3");
  +
$cmc->makeLast("None of the above");
  +
</pre>
  +
</p>
  +
<p>
  +
To force answers to appear in a certain order (like Yes followed by No), use only <code>$cmc->qa("question","Yes"); $cmc->makeLast("Yes","No");</code> and do not use <code>extra( )</code> at all. In this case, to randomize the question and answer, use
  +
<pre>
  +
@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");
  +
</pre>
 
</p>
  
</p>
 
</td>
  
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<td style="background-color:#ffdddd;border:black 1px dashed;">
 
<pre>
  
<pre>
−
# Print the text using $cmc->print_q() for the questions and
  
−
# $cmc->print_a() to print the answers.
  
 
BEGIN_TEXT
  
BEGIN_TEXT
   
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<td style="background-color:#ffcccc;padding:7px;">
  
<td style="background-color:#ffcccc;padding:7px;">
 
<p>
  
<p>
−
Main Text: Print the question and answers.
 +
Main Text: Print the question and answers. Print the question text using <code>$cmc->print_q()</code> and
  +
the list of all answers using <code>$cmc->print_a()</code>.
 
</p>
  
</p>
 
</td>
  
</td>

Revision as of 16:55, 1 January 2010

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.

Problem Techniques Index

PG problem file Explanation 
DOCUMENT();  

loadMacros(
"PG.pl",
"PGbasicmacros.pl",
"PGchoicemacros.pl",
"PGanswermacros.pl",
"PGcourse.pl",
);

TEXT(beginproblem());

Initialization: We must load PGchoicemacros.pl and PGanswermacros.pl. 

$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 $cmcwith $cmc->new_checkbox_multiple_choice();.

Use $cmc->qa("question","correct answer 1","correct answer 2"); to store the question string and correct answer strings. Note that unlike match lists and select lists, you cannot call qa( ) again.

Incorrect answers are specified as a list of arguments to the extra method.

To force an answer (either a new extra answer, or the correct answer) to appear last in the list of options, use the makeLast method. All answers not in makeLast() will be scrambled when the multiple choice problem is shown to students. If the only correct answer is "None of the above" (or "All of the above"), use 

$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 $cmc->qa("question","Yes"); $cmc->makeLast("Yes","No"); and do not use extra( ) at all. In this case, to randomize the question and answer, use 

@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 $cmc->print_q() and the list of all answers using $cmc->print_a(). 

install_problem_grader(~~&std_problem_grader);

$showPartialCorrectAnswers = 0;

ANS(checkbox_cmp($cmc->correct_ans));

ENDDOCUMENT();

Answer Evaluation: Grade the problem with checkbox_cmp. We use the standard problem grader and set $showPartialCorrectAnswers = 0; to withhold credit and hide the correct answers until all answers are correct. Otherwise, students can guess and check their answers by the partial credit or feedback received.

Problem Techniques Index

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