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<p class=MsoNormal><span style='color:#1F497D'>PS : further to my last email
what procedures are commonly used for testing the SIGNIFICANCE of difference in
test difficulties and student performance combined over two linked tests with
different student cohorts.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Thanks<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Imogene<o:p></o:p></span></p>

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