[LON-CAPA-users] Mean Tries < 1?
st.bisitz at ostfalia.de
Fri Mar 30 12:51:28 EDT 2012
Thanks for checking the details, Gerd. This makes kind of sense.
Any idea why the statistics say 0.91 and not 0.93?
Am 22.03.2012 22:37 schrieb Gerd Kortemeyer:
> On Mar 22, 2012, at 10:14 AM, Stefan Bisitz wrote:
>> I checked the dynamic meta data of a LON-CAPA problem and found 0.91 in "Mean Tries" in the block "Recent Detailed Assessment Statistical Data".
>> I thought this value represents the arithmetic average of tries considering all students who submitted at least one time their answer to this problem. This would mean minimum of 1.00 for "Mean Tries".
>> So, how is it possible to have a value lower than 1?
> Okay, here's what happened:
> 15 students attempted the problem
> 14 students got it correct on the first try
> 1 student had "irreconcilable unit," which is not counted as a try ("yellow box")
> Thus: (14 counted tries)/(15 students attempting)=0.93
> - Gerd.
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