> I am marking some 50-question, 4-choice, multiple choice tests. (About 
> 20 of them.)  The scores are noticeably low, 50%, 64%, 38%, 44%, 52%,...
> I begin to worry that the marking key I am using may be mismatched with 
> the version of the test I am marking.  After about nine papers marked, 
> just as I am about to review the key against the actual questions,...I 
> get a score of 84%.  I am immediately and intuitively certain the key is 
>  the correct one and that this test group is just unusually low 
> scoring.  Is there any science that discusses this sort of phenomena?

Maybe the one who got 84% was cheating using the same key as you had :-)

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