Re: Is there a graph that shows IQ and functioning grade level ?

Dear Carolyn, thank-you for your question. Although I have taught a testing 
and assessment course at the undergraduate level for many years, I really do 
not remember ever seeing anything similar to what you describe (which does 
not necessarily mean it does not exist). However, I should point out that if 
this graph does exist, it probably will not be psychometrically sound.  
There are many reasons for this.  Probably the most important one is that an 
IQ score (or any psychological test score for that matter) always contains a 
certain amount of measurement error. The reason for this is that 
psychological constructs (unlike physical ones) have to be measured 
indirectly. Therefore a person's "true" score on any psychological test 
falls somewhere in the range of the observed score (e.g., score obtained), 
plus and minus the standard error of measurement (SEM) of the specific test 
that was used. Without getting too technical, a person's obtained score on 
an IQ test may be due to factors other than the person's true ability 
level. Thus, even if a person scores an 85 on an IQ test, his or her "true" 
IQ may be 100 (or higher), or perhaps as low as 70 (or lower). The 
differences in obtained versus true scores may be due to an imperfect IQ 
test itself, lack of motivation on the part of the child (or even tester), 
cultural issues and simply chance. However, this is only the tip of this 
iceberg.  Another reason why I would not recommend that you use such a graph 
even if you find it is that there are a large number of IQ tests, each of 
which measure IQ in different ways. Which of these tests is measuring the 
real IQ? I do not know, and I don't think you would come to any consensus if 
you asked a group of psychologists. Along the same lines, even at the 
elementary school level, what a child learns in any specific grade depends 
on which school he/she attends and on the specific curriculum taught. So 
functioning at the sixth grade level may mean different things depending on 
the given school district. This is even more true at the high school level. 
Finally, if you had a gorup of 100 children all of whom scored an 85 on an 
IQ test, you will still find a great deal of diversity in skill levels 
within this group.  So, for all these reasons, I suggest that you abandon 
your search.