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American Statistical Association (ASA):
http://www.amstat.org/

The National Council of Teachers of Mathematics (NCTM):
http://www.nctm.org/

National Assessment of Educational Progress (NAEP):
http://www.doe.k12.ga.us/sla/ret/naep.html

National Center of Health Statistics (NCHS):
http://www.cdc.gov/nchs/default.htm