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At 17:00 -0700 8/31/05, Bernard Cleyet wrote:cut
How, pray tell, does one normalize such a test?
It's suitably complex.
What the CB does is to maintain a file of questions that have been
field-tested on large numbers of students. They keep track of the
fraction of people who answer each question, by the option they
choose (they are all 5-choice M/C questions), so they know what
fraction get it right and what fraction choose each of the possible
wrong answers. They gather all sorts of statistics about who takes
the test and use all this information to rate each question as to
it's degree of difficulty and what the spread of answers is, much of
which I don't understand. They sort the questions by topic and
difficulty (with a fairly fine mesh, so they can cover any give broad