<p>One way to measure the depth of the student body is comparing the achievement level for the 25th percentile on both the Critical Reading and the Math sections. I looked at the CR and M scores for each college in the USNWR Top 30 and compared this with the percentile for students nationally who scored at this level. This measurement tells you how far the school dipped in the SAT pool in its enrolled class. </p>
<p>For general comparative purposes, on a national basis, a score of 600 would place a student in the 78th percentile for Critical Reading and in the 74th percentile for Math. Approximately 314,000 students scored at 600 level or better on the Critical Reading section. Approximately 378,000 scored at the 600 level or better on the Math section. The total testing population for 2006 college bound students was 1,465,744. </p>
<p>On the Critical Reading sections, the 25% achievement level for all but three of the USNWR Top 30 scored at the 75th percentile or better. The exceptions were UC-Berkeley and U Michigan (580-74th percentile) and UCLA (570-71st percentile). On the Math sections, all of the USNWR Top 30 schools scored above the 75th percentile. </p>
<p>(Note: There may be some slight data mismatches as I am combining the Yahoo Education data with the collegeboard.com data. But assuming data patterns have not swung too much in the past year, the relationships between numbers should be valid.) </p>
<p>Here are the results:</p>
<p>USN Rank, School, CR 25% level, Percentile Rank, M 25% level, Percentile Rank</p>
<p>1 Princeton 680/ 93%/ 690/ 92%
2 Harvard 690/ 94%/ 700/ 93%
3 Yale 700/ 95%/ 690/ 92%
4 Cal Tech 690/ 94%/ 780/ 99%
4 Stanford 660/ 90%/ 680/ 91%
4 MIT 660/ 89%/ 720/ 96%
7 U Penn 650/ 89%/ 680/ 91%
8 Duke 690/ 94%/ 690/ 92%
9 U Chicago 670/ 92%/ 650/ 86%
9 Dartmouth 670/ 92%/ 680/ 91%
9 Columbia 660/ 90%/ 660/ 88%
12 Wash U StL 670/ 92%/ 700/ 93%
12 Cornell 620/ 83%/ 660/ 88%
14 Northwestern 650/ 89%/ 670/ 89%
15 Brown 670/ 92%/ 680/ 91%
16 J Hopkins 630/ 85%/ 660/ 88%
17 Rice 650/ 89%/ 680/ 91%
18 Emory 620/ 83%/ 650/ 86%
18 Vanderbilt 630/ 85%/ 650 86%
20 Notre Dame 600/ 79%/ 630/ 81%
21 UC Berkeley 580/ 74%/ 620/ 79%
21 Carnegie Mellon 610/ 82%/ 690/ 92%
23 Georgetown 640/ 87%/ 650/ 86%
24 U Michigan 580/ 74%/ 630/ 81%
24 U Virginia 600/ 79%/ 620/ 79%
26 UCLA 570/ 71%/ 610/ 76%
27 USC 630/ 85%/ 650/ 86%
27 Tufts 670/ 92%/ 670/ 89%
27 U North Carolina 590/ 77%/ 610/ 76%
30 Wake Forest 610/ 82%/ 670/ 89%</p>