[QTI] multiple possible correct answers?

[Pierre Gorissen]

Hi Devon,

As soon as you used the word float a dozen or so alarm bells went off in my 
head. Float is definitely not something simple. ;-)
You can't set ranges in responseDeclaration. Wouldn't be really much use as 
a way to enable easier response processing than the alternatives you have 
available at the moment in QTI 2.0

You don't explain exactly what you want to test, but let me try to explain 
you options using two, I agree not so great, examples.

#1 using equalRounded
A first type of question would be the one where you have 1 correct value 
with some margin of rounding say if you ask "what is a third of one?" and 
you want to allow anything from 1.3 up to 1.333333
Then you could put something like 1.3333 in the correctAnswer and use the 
<equalRounded> element to check if the answer is within the allowed range. 
For feedback you would probably just enter an inline or model feedback text 
to show the candidate.

#2 using <lt> and <gt>
If for example you want the candidate to enter an example of a comfortable 
temperature for a normal human and you would allow all temperatures within
the +15.0 - +25.0 degrees Celsius range (I know the question doesn't make 
that much sense) using equalRounded would still be possible, but not the 
most logical thing to use. Because in that case there is no optimal correct 
answer and it is better to simply use <lt> and <gt> in response processing 
to check if the value entered by the candidate is within that range.

If anyone could come up with examples that make more sense than the ones I 
used here I would be happy to create two example items based on that for 
inclusion in the QTI-examples set. Better yet of course if someone is wiling 
to provide examples for the two scenario's already incoded in QTI. :-)

Does this answer your question?

Pierre

----- Original Message ----- 
From: "Devon Copley" <DevonC at Review.com>
To: "IMS Question &amp;Test Interoperability" <ims-qti at lists.ucles.org.uk>
Sent: Thursday, March 02, 2006 8:55 PM
Subject: RE: [QTI] multiple possible correct answers?


Pierre -

Thanks very much for the quick and knowledgeable reply.  I do have
another question too - I'd appreciate any further light you could shed!

We're using an textEntryInteraction to collect a numeric user response.
In this case we'd like to specify a range of values which are correct.
Since we're collecting a float, not an integer, specifying a list of
possible correct values is not an option.  Is there any way to represent
such a range in our <responseDeclaration> block?

Thanks again -

Devon

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