Here are some links with instructions for utilizing the TI83-84 Statistics Functions

http://www.cbu.edu/~wschrein/media/Stat/TI83Pman.pdf

http://education.ti.com/educationportal/sites/US/nonProductSingle/activitybook_83_statistics.html

http://web.cocc.edu/srule/MTH243/other/tistat.PDF