!" # # $ $ $ $ # # $ $ % % # # % % & & & & ' ' ( ( ( ( ) ) &* &* &% &% &+ &+ +* +* &( &( &' &' &+ &+ &+ &+ && && & & &% &% &% &% &* &* ,* ,* ,'% ,'% ,*% ,*% ,'% ,'% ,, ,, ,'% ,'% ,' ,' ,'( ,'( ,'& ,'& ,(* ,(* %+ %+ %*& %*& %,,' %,,' %*%+ %*%+ %*%+ %*%+ ,)' ,)' ,(&) ,(&) ,'& ,'& ,'& ,'& ,' ,' ,,+' ,,+' ,,+' ,,+' ,') ,') ,%)' ,%)' ,&&& ,&&& ,&&& ,&&& ,+%, ,+%, ,'** ,'** ,'& ,'& %*%+ %*%+ 383 383 44,5 44,5 1695,7 1695,7 198,83 198,83 14775 14775 45,4 10 5,44 n X X i === ∑ 3,38 10 383 n Y Y i === ∑ ( ) 74534,10 )45,4(1083,198 3,3845,4107,1695 XnX Y.X.nYX ˆ 2 2 2 i ii 2 −= − ××− = − − =β ∑ ∑ 11676,8645,4).74534,10(3,38X ˆ Y ˆ 21 =−−=β−=β -./012 34 .5 04 4 5675. Ý nghóa của các hệ số hồi quy: 11676,86 ˆ 1 =β /48/972 :/:; *< ii X74534,1011676,86Y ˆ −= 74534,10 ˆ 2 −=β / 5= . > ? !5" , . @A/ 7 1: . @1: 275=..45 !?",*&+A< %"-/5@B C * β % D*EC , β % ≠*E - ( ) ∑ =−=−= 1,106)3,38(1014775YnYTSS 2 2 2 i ( ) [ ] ∑ ∑ = −β=β= n 1i 2 2 i 2 2 2 i 2 2 XnX) ˆ (x) ˆ (ESS [ ] 9472,92805,0)11676,10( )45,4(1083,198)11676,10( 2 22 =−= −−= 1528,139472,921,106ESSTSSRSS =−=−= 6441,1 8 1528,13 2n RSS ˆ 2 == − =σ 04236,2 805,0 6441,1 x ˆ ) ˆ var( n 1i 2 i 2 2 == σ =β ∑ = 42911,104236,2) ˆ var() ˆ (se 22 ==β=β 52,7 42911,1 74534,10 ) ˆ (se ˆ t 2 2 −= − = β β = 31 5 4 8 α D +F 7 **%+ !("D%*'!2 α " 37D+%G%*' C * < - : : 1 @ 1: . @1: 5= .>< " H @1 9B # . /A .50456 . i * i X34,1074576,86116Y ˆ −= 876,0 1,106 9472,92 TSS ESS R 2 === &" 25,1 3,38 45,4 74534,10 Y X . dX dY E X/Y −=−== +" YÙ nghóa:H5=. > ? !5" ,F 7 1: . @1:275=. .45!?",%+F< )Y ˆ var( 0 578,0 805,0 )45,44( 10 1 6441,1 2 = − += '"