Video lecture for Brase-Brase Understandable Statistics 8 Ed, Ch 8.2
Source: Chalk Dust Productions, Houghton Mifflin Co
Source: jbstatistics at YouTube: http://www.youtube.com/watch?annotation_id=annotation_124979&feature=iv&src_vid=XU_3fLy2SKs&v=Uv6nGIgZMVw
Source: flactemb at YouTube: http://www.youtube.com/watch?v=BpvefsfpgO4
Source: onlinestatbook at YouTube: http://www.youtube.com/watch?v=pgUyNDRCf94