scott wrote:
>> 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 :-)
> 
Good point.

I think another explanation is that the key was correct but some static 
set of answers were incorrect so that all the marks were depressed by a 
constant amount.

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