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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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