UsingWW: changing true/false to yes/no

Hi Mary,

You will need to change all occurrences of "True" to "Yes" and "False" to "No". You likely had changed them in the $tf->ra_pop_up_list() but not in the $tf -> qa() part.

Also, since you used $tf->choose(5); instead of $tf->choose(6); as was originally written, you will want to change the custom grader at the bottom of the problem:

$ENV{'grader_numright'} = [2,4,5]; # changed [2,4,6] to [2,4,5] since there are 5 problems total
$ENV{'grader_scores'} = [0.3,0.6,1];
$ENV{'grader_message'} = "You can earn " .
"30% partial credit for 2 - 3 correct answers, and " .
"60% partial credit for 4 correct answers."; # changed '4 - 5' to '4'

This custom grader will give 0% for 0-1 correct answers, 30% for 2-3 correct answers, and 60% for 4 correct answers, and 100% for 5 correct answers. If you forget to change [2,4,6] to [2,4,5], then the maximum possible score is 60%.

I also caught a mismatched parentheses error: { ) needed to be changed to { }.

If you want to be able to see which lines in your code are different from my code, I would recommend using a utility such as WinMerge, which is free and easily found using google. WinMerge will allow you to open two files at the same time and view them side-by-side. Also, scrolling will be in sync for both files and lines that are different will be highlighted.

I've provided a working example below.

Have a good evening!

Paul Pearson

#####################################

DOCUMENT();

loadMacros(
"PGstandard.pl",
"MathObjects.pl",
"PGchoicemacros.pl",
"PGgraders.pl",
);

TEXT(beginproblem());

###########################
# Setup

Context("Numeric");

$den = random(2,9,1);
$c = Compute("4*$den");

# Create and use pop up lists
$tf = new_select_list();
$tf->rf_print_q(~~&pop_up_list_print_q);

# Choices presented to students
$tf->ra_pop_up_list( [
"No answer" => "?",
"Yes" => "Yes",
"No" => "No",
]);

# Questions and answers

Context()->texStrings;
$tf -> qa (
"You need to divide $$c$ cookies among $$den$ people.",
"No",
"You need to find $\frac{1}{$den}$ of $$c$ ounces.",
"No",
"You need to find how many $\frac{1}{$den}$ doses there are in $$c$ ounces.",
"Yes",
"A sale advertises $\frac{1}{$den}$ off a $$c$ dollar purchase.",
"No",
"You purchased $ $c$ yards of material. Each kit requires $\frac{1}{$den}$ yard of material. You need to determine how many kits you can make.",
"Yes",
"You have $$c$ flowers and you need to determine how many bouquets of $$den$ flowers you can make.",
"No",
"If you do not pay your bill in by the due date you will be charged a fee of $\frac{1}{$den}$ of the bill which totals $$c$ dollars.",
"No",
);

Context()->normalStrings;

# How many questions to use
$tf->choose(5);

###########################
# Main text

Context()->texStrings;
BEGIN_TEXT
Which of the following describes a situation where division by $\frac{1}{$den}$ would be needed?
$BR
\{ $tf -> print_q() \}
END_TEXT
Context()->normalStrings;

############################
# Answer evaluation

$showPartialCorrectAnswers = 0;

#
# Incremental grader
#
install_problem_grader(~~&custom_problem_grader_fluid);
$ENV{'grader_numright'} = [2,4,5];
$ENV{'grader_scores'} = [0.3,0.6,1];
$ENV{'grader_message'} = "You can earn " .
"30% partial credit for 2 - 3 correct answers, and " .
"60% partial credit for 4 correct answers.";

#
# All or nothing grader
#
# install_problem_grader(~~&std_problem_grader);

ANS( str_cmp( $tf->ra_correct_ans() ) );

############################
# Solution

Context()->texStrings;
BEGIN_SOLUTION
${PAR}SOLUTION:${PAR}
You could put an explanation here.
END_SOLUTION
Context()->normalStrings;

COMMENT("MathObject version.");

ENDDOCUMENT();

Using WeBWorK

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changing true/false to yes/no

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