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With some help from co-worker, Tim Lauck, we were able to arrive at a custom answer checker for weighted answers involving round-off error.

For any who might want to use something similar here is the code block:

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

#### Custom Weighted Answer Checker for Round-off error:

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

## The correct value: $c

## The student's entry: $s

## The returned score: $ans

## Note: Be sure that the tolerance in the settings (0.0001)

## do not restrict the custom answer checker.

WEIGHTED_ANS($mean->cmp(

checker => sub {

my ($c, $s, $ans) = @_;

$diff = abs($mean -$s); ## establishing the error

if(($diff <= 0.01) && ($diff >= 0.0002))

{

$score = 0; ## has round-off error

$ans->{ans_message} = "You have round-off error. Try using exact values (think: Fractions) in your calculation." ;

} elsif($s == $wm) {

$score = 0; ## Using a geometric mean in error.

$ans->{ans_message} = "No, Your mean calculation did not account for differing likelihoods." ;

} elsif($s == $mean) {

$score = 1; ## a correct calculation within 0.0001

$ans->{ans_message} = "Yes!" ;

} else {

$ans->{ans_message} = "Nope! But, Keep Trying!";

$score= 0; ### All other scenarios

}

return $score;

}

),10); ## 10pts is the weighted value of this problem.

Tim

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