DOC: update stats tutorial
DOC: update stats tutorial

WarrenWeckesser/scipy,endolith/scipy,vigna/scipy,anntzer/scipy,mdhaber/scipy,scipy/scipy,anntzer/scipy,scipy/scipy,perimosocordiae/scipy,vigna/scipy,ilayn/scipy,mdhaber/scipy,Eric89GXL/scipy,perimosocordiae/scipy,ilayn/scipy,anntzer/scipy,vigna/scipy,andyfaff/scipy,tylerjereddy/scipy,Stefan-Endres/scipy,zerothi/scipy,ilayn/scipy,endolith/scipy,zerothi/scipy,perimosocordiae/scipy,e-q/scipy,anntzer/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,ilayn/scipy,e-q/scipy,Stefan-Endres/scipy,ilayn/scipy,zerothi/scipy,andyfaff/scipy,andyfaff/scipy,grlee77/scipy,Eric89GXL/scipy,Eric89GXL/scipy,rgommers/scipy,vigna/scipy,grlee77/scipy,endolith/scipy,endolith/scipy,e-q/scipy,grlee77/scipy,tylerjereddy/scipy,WarrenWeckesser/scipy,rgommers/scipy,mdhaber/scipy,endolith/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,andyfaff/scipy,matthew-brett/scipy,zerothi/scipy,Eric89GXL/scipy,andyfaff/scipy,Stefan-Endres/scipy,grlee77/scipy,vigna/scipy,rgommers/scipy,scipy/scipy,tylerjereddy/scipy,tylerjereddy/scipy,mdhaber/scipy,matthew-brett/scipy,andyfaff/scipy,scipy/scipy,matthew-brett/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,matthew-brett/scipy,scipy/scipy,Stefan-Endres/scipy,Eric89GXL/scipy,scipy/scipy,mdhaber/scipy,rgommers/scipy,endolith/scipy,Eric89GXL/scipy,Stefan-Endres/scipy,zerothi/scipy,matthew-brett/scipy,tylerjereddy/scipy,ilayn/scipy,grlee77/scipy,zerothi/scipy,rgommers/scipy,e-q/scipy,WarrenWeckesser/scipy,anntzer/scipy,mdhaber/scipy,anntzer/scipy,WarrenWeckesser/scipy,e-q/scipy