[LON-CAPA-users] correct answer changing to incorrect

[James Mueller]

More details on this problem.

If I check grades, he does have credit for getting this one correct.  It is just that when he looks at the problem, it is displayed as incorrect answer.  The other thing I don't understand is the due date for this problem was Nov. 29, so where does this incorrect submission on Nov 30 come from?

-J. Mueller

On Dec 8, 2010, at 3:51 PM, James Mueller wrote:

> A student just complained that he solved a problem but later Lon Capa said he was incorrect.  I looked at his submissions and see the following.  From the submissions, it looks like he completed every part of the problem on Nov 21, but on Nov 30, his first incorrect answer for the first part appears to be entered again, and it is listed as the first trial.  I can give him credit for getting this correct, but does anyone have any ideas as to how this might happen?
> 
> -Jim Mueller
> 
> Sun Nov 21 06:34:31 pm 2010 (EST)Part: 11 (ID 12) Trial not counted  0.0490
> Part: 11  no_unit 
>  Sun Nov 21 06:34:33 pm 2010 (EST)Part: 11 (ID 12) Trial 1  0.0490 m
> Part: 11  incorrect 
>  Sun Nov 21 06:35:54 pm 2010 (EST)Part: 11 (ID 12) Trial 2  2.0944 m
> Part: 11  approx_ans 
>  Sun Nov 21 06:38:14 pm 2010 (EST)Part: 13 (ID 14) Trial not counted  284.8377 m/s
> Part: 13  sig_fail 
>  Sun Nov 21 06:38:19 pm 2010 (EST)Part: 13 (ID 14) Trial 1  284.81 m/s
> Part: 13  incorrect 
>  Sun Nov 21 06:38:23 pm 2010 (EST)Part: 13 (ID 14) Trial 2  284.84 m/s
> Part: 13  incorrect 
>  Sun Nov 21 06:39:19 pm 2010 (EST)Part: 13 (ID 14) Trial 3  45.33 m/s
> Part: 13  approx_ans 
>  Sun Nov 21 06:41:29 pm 2010 (EST)Part: 15 (ID 16) Trial 1  6.66 m/s
> Part: 15  approx_ans 
>  Tue Nov 30 05:10:17 am 2010 (EST)Part: 11 (ID 12) Trial 1  0.0490 m
> Part: 11  incorrect
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