2)H0:Hx=H,;H1:Hx>H。拒绝域:T>ta/2(n2+ny-2) 已知n2=7,nn=8,x=0.24,y=0.13,S2=0.00913,S2=0.0088 a=0.05,to1(13)=265 0.24-0.13 则T= =2.677>2.65 0.079391/7+1/8 故拒绝原假设故拒绝原假设。 则 已知 。拒绝域： 6526772 8171079390 130240 65213050 00913013024087 003880 2 2 010 2 2 0 1 2 .. //. .. T ..)(t,. ,.S,.S,.y,.x,n,n :H;:H)( )nn(tT . x y x y yx yx yx/ >= + − = = = ==== = = = > −+> α μμμμ α