[LON-CAPA-users] adjusting variables on a problem that's been released?

[Lucas, Mark]

Doug,

Any student that has had the answer recorded as correct will still have the
problem marked correct. The system does not re-evaluate the correctness of
an answer.

Anyone viewing the problem from the point it has been republished, will see the
new problem with the new number. Any solution submitted will be checked against
the new version of the problem. Students who have not yet gotten the problem
will need to re-calculate their answer.

Later,
Mark




On Oct 4, 2011, at 10:27 AM, Mills, Douglas G wrote:

Hey All,

We have an odd situation where in a very small percentage of cases our random variables are working together to generate an impossible answer (“mix 1004.2 mL of X and –4.2 mL of Y to form 1 L of solution...”). The problem has been released and these can be dealt with on a case by case basis as needed if necessary, but we are wondering what would happen if we tweaked the range of one of the variables to eliminate the possibility of the answers over 1000 mL.  Specifically, what happens to students who have already done the problem with that variable possibly out of the new range (there are several variables involved so only in a very few cases do the calculations result in a solution out of range) -- does Lon-Capa ignore those cases where the problem has already been completed?  What happens if a student has started the problem and so had the values set, but has not completed it — do the original values stay the same even though they are now out of range in the newly published version?

Thank you in advance for guidance on this issue!

Doug

Douglas Mills
Director of Instructional Technologies
Department of Chemistry
University of Illinois
dmills at illinois.edu<x-msg://2470/dmills@illinois.edu>
(217) 244-5739

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Mark Lucas  email: lucasm at ohiou.edu<mailto:lucasm at ohiou.edu>
252D Clippinger Lab phone: (740)597-2984
Department of Physics and Astronomy fax: (740)593-0433
Ohio University
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