Biostatistics:
Topics and information related to Statistics
http://en.wikipedia.org/wiki/Biostatistics
http://www.medpagetoday.com/Medpage-Guide-to-Biostatistics.pdf
http://pharmassociates.blogspot.com/2008/02/biostatisticsstatistics.html
Applications of Biostatistics:
Sampling:
http://www.stat.yale.edu/Courses/1997-98/101/sample.htm
http://en.wikipedia.org/wiki/Sampling_(statistics)
Simple random sampling:
http://www.coventry.ac.uk/ec/~nhunt/meths/random.html
Standard Error:
http://en.wikipedia.org/wiki/Standard_error_(statistics)
http://davidmlane.com/hyperstat/A103397.html
Stratified Random Sampling:
http://www.coventry.ac.uk/ec/~nhunt/meths/strati.html
http://en.wikipedia.org/wiki/Stratified_sampling