Statistics

[Dang Hung Thang <thang@mathematik.uni-Bremen.de>]

Hi anh Tua^'n (NSW) et al
Bu+~a tru+o+'c anh Tua^'n co' cho ra(`ng nowadays Y ho.c la` mo^.t
combination  giu+~a Knowlegde va` Stat. To^i tha^'y y' kie^'n ddo' la`
chi'nh xa'c. Ngu+o+`i Ba'c sy~ muo^'n la`m research thi` pha?i am
hie^?u Stat, pha?i co' tu+ duy Tho^'ng ke^ ( Statistical thingking)(
Ne^'u anh ta chi? chu+~a be^.nh tho^i thi` co' the^? kho^ng
ca^`n). Da'ng tie^'c la` o+? nha` Stat chu+a ddu+o+.c chu' y' ddu'ng
mu+'c . Va^~n co`n nhie^`u ca'c vi. BS ly' lua^.n : Thuo^'c A cho 100
ngu+o+`i uo^'ng thi` 60 kho?i, thuo^'c B chi? co' 58 ngu+o+`i
kho?i. Va^.y thuo^'c A to^'t ho+n thuo^'c B. Hoa(.c: To^i co' trie^.u
chu+'ng A ma` kho^ng bi. be^.nh B, bo^' to^i va` ca? o^ng to^i cu~ng
the^'. Va^.y trie^.u chu+'ng A kho^ng co' lie^n quan to+'i be^.nh B.
Ca'c vi. BS thu+o+`ng ghe't va` so+. Stat. Thu+.c ra ddo' la` mo.^t
mo^n ho.c thu' vi.  Kho^ng ca^`n nhie^`u background ve^` Toa'n va^~n
hie^?u to^'t ddu+o+.c. Co' mo^.t paradox sau dda^y elementery but
interesting.
Ba tu` nha^n A,B va` C co' tha`nh ti'ch ca?i ta.o nhu+
nhau. Ho. du+o+c bie^'t nha^n
nga`y Quo^'c kha'ch  co' 2 ngu+o+`i se~ ddu+o+.c th?a. A nghi~
ra(`ng nhu+ va^.y xa'c sua^'t dde^? mi`nh ddu+o+.c tha? la` 2/3.  A
ho?i do` mo^.t ngu+o+`i o+? to`a a'n xin cho  bie^'t te^n cu?a mo^.t
ngu+o+`i ddu+o.c tha? kha'c A ( A kho^ng da'm ho?i tha(?ng ve^`
mi`nh).Ngu+o+`i ddo' tra? lo+`i la` B ddu+o+.c tha?. A hoa?ng qua' vi`
ba^y gio+` XS ddu+o+. tha? cu?a mi`nh chi? co`n 1/2.
Va^.y XS ddu+o+c tha? cua? A la` bao nhie^u?
Cheers
Thang