here is one clue .... do you think that the difference in ability between 
someone with an IQ of 100 compared to someone with an IQ of 110 ... has the 
same meaning as the difference between a person with an IQ of 140 ... and 
one with a 150?

At 12:00 PM 8/25/00 -0400, William Levine wrote:
>Hello,
>
>I am teaching an Introduction to Statistics course in psychology, and in
>class the other day, I brought up the issue that SAT scores and IQ scores
>may not really be interval scales. My TA pointed out that they are
>*standardized* tests, and that the intervals really are designed to mean
>something. I came back with the comment that we really don't know what these
>tests measure.
>
>Without raising the specter of what IQ and SAT tests really measure, does
>anyone have any comments that might be helpful in telling students what to
>think about this? Either that, or any references that discuss this issue
>explicitly.
>
>Thanks!
>
>     Bill
>--
>
>William Levine
>Department of Psychology
>University of North Carolina-Chapel Hill
>Chapel Hill, NC 27599-3270
>[EMAIL PROTECTED]
>http://www.unc.edu/~whlevine
>
>
>
>
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