... t -test -AAR -5 -4 -3 -2 -1 0,68014 0,37781 -0 ,53865 0,04251 0,56152 0,59240 -0 ,82692 0,47004 -0 ,44433 0,63622 0,40110 -1 ,49336 -1 ,11555 -1 ,65420 -1 ,64995 -1 ,08844 -0 ,49604 -1 ,32296 -0 ,85293 -1 ,29725 ... bình - Nhóm C Date -5 -4 -3 -2 -1 AAR (%) -0 ,23084 -0 ,05696 -0 ,32236 -0 ,17582 0,72270 1,27915 -1 ,15459 0,57887 -1 ,50746 -0 ,02412 0,25356 CAAR (%) -5 ,31265 -5 ,36962 -5 ,69198 -5 ,86780 -5 ,12510 -3 ,84595 ... 0.49 -0 .21956 -0 .61 0.63060 1.70* 0.50138 1.51 0.11925 0.45 -0 .14534 -0 .54 -0 .06967 -0 .22 0.19337 0.66 0.25838 0.67 Ngày -1 0 -9 -8 -7 -6 -5 -4 -3 -2 -1 10 Mẫu liệu 65 quan sát (2) AAR (%) t -test...