C\u00e1c Kh\u00e1i Ni\u1ec7m C\u1ed1t L\u00f5i Trong Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n<\/h2>\n

1. T\u1ed5ng Th\u1ec3 V\u00e0 M\u1eabu L\u00e0 G\u00ec?<\/h3>\n

T\u1ed5ng th\u1ec3 (Population)<\/strong> l\u00e0 to\u00e0n b\u1ed9 \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ea7n nghi\u00ean c\u1ee9u. V\u00ed d\u1ee5: t\u1ea5t c\u1ea3 h\u1ecdc sinh t\u1ea1i Vi\u1ec7t Nam.
\nM\u1eabu (Sample)<\/strong> l\u00e0 m\u1ed9t ph\u1ea7n \u0111\u01b0\u1ee3c ch\u1ecdn ra t\u1eeb t\u1ed5ng th\u1ec3 \u0111\u1ec3 nghi\u00ean c\u1ee9u. V\u00ed d\u1ee5: 1.000 h\u1ecdc sinh \u0111\u01b0\u1ee3c kh\u1ea3o s\u00e1t ng\u1eabu nhi\u00ean.<\/p>\n

Trong h\u1ea7u h\u1ebft tr\u01b0\u1eddng h\u1ee3p th\u1ef1c t\u1ebf, ch\u00fang ta l\u00e0m vi\u1ec7c v\u1edbi m\u1eabu thay v\u00ec t\u1ed5ng th\u1ec3 v\u00ec l\u00fd do chi ph\u00ed v\u00e0 th\u1eddi gian. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 m\u1eabu ph\u1ea3i c\u00f3 t\u00ednh \u0111\u1ea1i di\u1ec7n \u0111\u1ec3 k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch c\u00f3 gi\u00e1 tr\u1ecb.<\/p>\n

\u0110\u1ea1i l\u01b0\u1ee3ng<\/th>\n

\u0110\u1ecbnh ngh\u0129a<\/th>\n

\u01afu \u0111i\u1ec3m<\/th>\n

Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n

D\u00f9ng khi n\u00e0o<\/th>\n<\/tr>\n<\/thead>\n

Mean<\/strong><\/td>\n

T\u1ed5ng \/ s\u1ed1 ph\u1ea7n t\u1eed<\/td>\n

D\u00f9ng to\u00e0n b\u1ed9 d\u1eef li\u1ec7u<\/td>\n

B\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi outlier<\/td>\n

D\u1eef li\u1ec7u ph\u00e2n ph\u1ed1i \u0111\u1ec1u<\/td>\n<\/tr>\n

Median<\/strong><\/td>\n

Gi\u00e1 tr\u1ecb gi\u1eefa<\/td>\n

Kh\u00e1ng outlier t\u1ed1t<\/td>\n

B\u1ecf qua nhi\u1ec1u th\u00f4ng tin<\/td>\n

C\u00f3 outlier, thu nh\u1eadp, nh\u00e0 \u0111\u1ea5t<\/td>\n<\/tr>\n

Mode<\/strong><\/td>\n

Gi\u00e1 tr\u1ecb l\u1eb7p nhi\u1ec1u nh\u1ea5t<\/td>\n

D\u00f9ng \u0111\u01b0\u1ee3c cho \u0111\u1ecbnh t\u00ednh<\/td>\n

C\u00f3 th\u1ec3 kh\u00f4ng t\u1ed3n t\u1ea1i<\/td>\n

D\u1eef li\u1ec7u ph\u00e2n lo\u1ea1i, kh\u1ea3o s\u00e1t<\/td>\n<\/tr>\n

Variance<\/strong><\/td>\n

Trung b\u00ecnh b\u00ecnh ph\u01b0\u01a1ng l\u1ec7ch<\/td>\n

\u0110o ph\u00e2n t\u00e1n ch\u00ednh x\u00e1c<\/td>\n

\u0110\u01a1n v\u1ecb b\u00ecnh ph\u01b0\u01a1ng<\/td>\n

So s\u00e1nh m\u1ee9c \u0111\u1ed9 ph\u00e2n t\u00e1n<\/td>\n<\/tr>\n

Std Dev<\/strong><\/td>\n

\u221aVariance<\/td>\n

C\u00f9ng \u0111\u01a1n v\u1ecb v\u1edbi d\u1eef li\u1ec7u<\/td>\n

Nh\u1ea1y c\u1ea3m v\u1edbi outlier<\/td>\n

Ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng, t\u00e0i ch\u00ednh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u1ee8ng D\u1ee5ng Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n Trong Th\u1ef1c T\u1ebf<\/h2>\n

Trong Gi\u00e1o D\u1ee5c<\/h3>\n
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T\u00ednh \u0111i\u1ec3m trung b\u00ecnh h\u1ecdc k\u1ef3 c\u1ee7a h\u1ecdc sinh<\/li>\n
X\u1ebfp h\u1ea1ng v\u00e0 so s\u00e1nh k\u1ebft qu\u1ea3 h\u1ecdc t\u1eadp<\/li>\n
Ph\u00e2n t\u00edch ph\u00e2n ph\u1ed1i \u0111i\u1ec3m thi \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec1 b\u00e0i<\/li>\n<\/ul>\n
Trong Kinh Doanh<\/h3>\n
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Ph\u00e2n t\u00edch doanh thu trung b\u00ecnh theo th\u00e1ng\/qu\u00fd\/n\u0103m<\/li>\n
Ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m b\u1eb1ng \u0111\u1ed9 l\u1ec7ch chu\u1ea9n<\/li>\n
Kh\u1ea3o s\u00e1t s\u1ef1 h\u00e0i l\u00f2ng kh\u00e1ch h\u00e0ng b\u1eb1ng b\u1ea3ng t\u1ea7n s\u1ed1<\/li>\n
D\u1ef1 b\u00e1o xu h\u01b0\u1edbng th\u1ecb tr\u01b0\u1eddng<\/li>\n<\/ul>\n
Trong Y T\u1ebf V\u00e0 S\u1ee9c Kh\u1ecfe<\/h3>\n
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T\u00ednh ch\u1ec9 s\u1ed1 BMI trung b\u00ecnh theo \u0111\u1ed9 tu\u1ed5i<\/li>\n
Ph\u00e2n t\u00edch t\u1ec9 l\u1ec7 m\u1eafc b\u1ec7nh theo v\u00f9ng \u0111\u1ecba l\u00fd<\/li>\n
Th\u1eed nghi\u1ec7m l\u00e2m s\u00e0ng v\u00e0 ki\u1ec3m \u0111\u1ecbnh k\u1ebft qu\u1ea3 \u0111i\u1ec1u tr\u1ecb<\/li>\n<\/ul>\n
Trong T\u00e0i Ch\u00ednh<\/h3>\n
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\u0110o l\u01b0\u1eddng r\u1ee7i ro \u0111\u1ea7u t\u01b0 b\u1eb1ng \u0111\u1ed9 l\u1ec7ch chu\u1ea9n l\u1ee3i nhu\u1eadn<\/li>\n
So s\u00e1nh hi\u1ec7u su\u1ea5t c\u00e1c danh m\u1ee5c \u0111\u1ea7u t\u01b0<\/li>\n
Ph\u00e2n t\u00edch xu h\u01b0\u1edbng gi\u00e1 c\u1ed5 phi\u1ebfu<\/li>\n<\/ul>\n
Ph\u1ea7n Tr\u0103m Trong Th\u1ed1ng K\u00ea \u2014 C\u1ea7u N\u1ed1i Quan Tr\u1ecdng<\/h2>\n
M\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng quan tr\u1ecdng nh\u1ea5t c\u1ee7a th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n ch\u00ednh l\u00e0 vi\u1ec7c t\u00ednh v\u00e0 \u0111\u1ecdc t\u1ec9 l\u1ec7 ph\u1ea7n tr\u0103m<\/strong>. G\u1ea7n nh\u01b0 m\u1ecdi ch\u1ec9 s\u1ed1 th\u1ed1ng k\u00ea \u0111\u1ec1u \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng ph\u1ea7n tr\u0103m \u0111\u1ec3 d\u1ec5 so s\u00e1nh:<\/p>\n
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T\u1ea7n su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i = (t\u1ea7n s\u1ed1 \/ t\u1ed5ng) \u00d7 100%<\/li>\n
T\u1ec9 l\u1ec7 t\u0103ng tr\u01b0\u1edfng = (gi\u00e1 tr\u1ecb m\u1edbi – gi\u00e1 tr\u1ecb c\u0169) \/ gi\u00e1 tr\u1ecb c\u0169 \u00d7 100%<\/li>\n
Ph\u1ea7n tr\u0103m t\u00edch l\u0169y trong b\u1ea3ng t\u1ea7n s\u1ed1<\/li>\n<\/ul>\n
\u0110\u1ec3 n\u1eafm v\u1eefng c\u00e1ch t\u00ednh ph\u1ea7n tr\u0103m, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam h\u01b0\u1edbng d\u1eabn chi ti\u1ebft t\u1ea1i t\u00ednh ph\u1ea7n tr\u0103m<\/strong> \u2014 c\u00f4ng c\u1ee5 v\u00e0 h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n<\/a>.<\/p>\n
Quy Tr\u00ecnh Ph\u00e2n T\u00edch Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n 5 B\u01b0\u1edbc<\/h2>\n
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Thu th\u1eadp d\u1eef li\u1ec7u:<\/strong> X\u00e1c \u0111\u1ecbnh m\u1ee5c ti\u00eau, ch\u1ecdn m\u1eabu, thu th\u1eadp s\u1ed1 li\u1ec7u \u0111\u00e1ng tin c\u1eady.<\/li>\n
S\u1eafp x\u1ebfp v\u00e0 t\u1ed5 ch\u1ee9c:<\/strong> L\u1eadp b\u1ea3ng t\u1ea7n s\u1ed1, s\u1eafp x\u1ebfp d\u1eef li\u1ec7u theo th\u1ee9 t\u1ef1.<\/li>\n
T\u00ednh c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng m\u00f4 t\u1ea3:<\/strong> Mean, median, mode, variance, std dev.<\/li>\n
Tr\u1ef1c quan h\u00f3a:<\/strong> V\u1ebd bi\u1ec3u \u0111\u1ed3 c\u1ed9t, \u0111\u01b0\u1eddng, tr\u00f2n \u0111\u1ec3 th\u1ea5y xu h\u01b0\u1edbng.<\/li>\n
Di\u1ec5n gi\u1ea3i v\u00e0 k\u1ebft lu\u1eadn:<\/strong> R\u00fat ra \u00fd ngh\u0129a t\u1eeb s\u1ed1 li\u1ec7u, \u0111\u01b0a ra khuy\u1ebfn ngh\u1ecb.<\/li>\n<\/ol>\n
C\u00e1c L\u1ed7i Th\u01b0\u1eddng G\u1eb7p Khi H\u1ecdc Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n<\/h2>\n
L\u1ed7i 1: Nh\u1ea7m Mean V\u1edbi Median<\/h3>\n
Nhi\u1ec1u ng\u01b0\u1eddi m\u1eb7c \u0111\u1ecbnh d\u00f9ng trung b\u00ecnh c\u1ed9ng cho m\u1ecdi t\u00ecnh hu\u1ed1ng. Nh\u01b0ng khi d\u1eef li\u1ec7u c\u00f3 outlier (gi\u00e1 tr\u1ecb c\u1ef1c \u0111oan), median s\u1ebd ph\u1ea3n \u00e1nh th\u1ef1c t\u1ebf ch\u00ednh x\u00e1c h\u01a1n. V\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh: thu nh\u1eadp b\u00ecnh qu\u00e2n \u0111\u1ea7u ng\u01b0\u1eddi b\u1ecb k\u00e9o l\u00ean b\u1edfi m\u1ed9t s\u1ed1 \u00edt ng\u01b0\u1eddi si\u00eau gi\u00e0u.<\/p>\n
L\u1ed7i 2: B\u1ecf Qua \u0110\u1ed9 Ph\u00e2n T\u00e1n<\/h3>\n
Hai t\u1eadp d\u1eef li\u1ec7u c\u00f3 th\u1ec3 c\u00f3 c\u00f9ng mean nh\u01b0ng r\u1ea5t kh\u00e1c nhau. V\u00ed d\u1ee5: nh\u00f3m A c\u00f3 \u0111i\u1ec3m {9, 10, 10, 9, 7} v\u00e0 nh\u00f3m B c\u00f3 \u0111i\u1ec3m {5, 10, 10, 10, 10} \u0111\u1ec1u c\u00f3 mean g\u1ea7n nhau nh\u01b0ng \u0111\u1ed9 l\u1ec7ch chu\u1ea9n kh\u00e1c nhau ho\u00e0n to\u00e0n.<\/p>\n
L\u1ed7i 3: K\u1ebft Lu\u1eadn Sai T\u1eeb M\u1eabu Nh\u1ecf<\/h3>\n
M\u1eabu qu\u00e1 nh\u1ecf (d\u01b0\u1edbi 30 quan s\u00e1t) c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn k\u1ebft lu\u1eadn kh\u00f4ng \u0111\u00e1ng tin c\u1eady. Lu\u00f4n ki\u1ec3m tra k\u00edch th\u01b0\u1edbc m\u1eabu tr\u01b0\u1edbc khi t\u1ed5ng qu\u00e1t h\u00f3a.<\/p>\n
L\u1ed7i 4: Nh\u1ea7m T\u01b0\u01a1ng Quan V\u1edbi Nh\u00e2n Qu\u1ea3<\/h3>\n
Hai bi\u1ebfn s\u1ed1 t\u01b0\u01a1ng quan m\u1ea1nh kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 bi\u1ebfn n\u00e0y g\u00e2y ra bi\u1ebfn kia. V\u00ed d\u1ee5: s\u1ed1 l\u01b0\u1ee3ng kem que b\u00e1n ra t\u01b0\u01a1ng quan v\u1edbi s\u1ed1 v\u1ee5 \u0111u\u1ed1i n\u01b0\u1edbc kh\u00f4ng ph\u1ea3i v\u00ec kem g\u00e2y \u0111u\u1ed1i n\u01b0\u1edbc, m\u00e0 v\u00ec c\u1ea3 hai \u0111\u1ec1u t\u0103ng v\u00e0o m\u00f9a h\u00e8.<\/p>\n
C\u00e2u H\u1ecfi Th\u01b0\u1eddng G\u1eb7p (FAQ)<\/h2>\n
Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n g\u1ed3m nh\u1eefng g\u00ec?<\/h3>\n
Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n g\u1ed3m c\u00e1c kh\u00e1i ni\u1ec7m n\u1ec1n t\u1ea3ng: c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng \u0111o xu h\u01b0\u1edbng trung t\u00e2m (mean, median, mode), c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng \u0111o ph\u00e2n t\u00e1n (ph\u01b0\u01a1ng sai, \u0111\u1ed9 l\u1ec7ch chu\u1ea9n), t\u1ea7n s\u1ed1 v\u00e0 t\u1ea7n su\u1ea5t, c\u00f9ng v\u1edbi kh\u00e1i ni\u1ec7m v\u1ec1 t\u1ed5ng th\u1ec3, m\u1eabu v\u00e0 bi\u1ebfn s\u1ed1. \u0110\u00e2y l\u00e0 nh\u1eefng c\u00f4ng c\u1ee5 c\u1ea7n thi\u1ebft \u0111\u1ec3 m\u00f4 t\u1ea3 v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u c\u01a1 b\u1ea3n.<\/p>\n
H\u1ecdc th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n c\u00f3 kh\u00f3 kh\u00f4ng?<\/h3>\n
Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n kh\u00f4ng kh\u00f3 n\u1ebfu b\u1ea1n n\u1eafm v\u1eefng c\u00e1c kh\u00e1i ni\u1ec7m t\u1eebng b\u01b0\u1edbc. B\u1eaft \u0111\u1ea7u v\u1edbi trung b\u00ecnh c\u1ed9ng, sau \u0111\u00f3 hi\u1ec3u trung v\u1ecb v\u00e0 mode, r\u1ed3i ti\u1ebfn \u0111\u1ebfn ph\u01b0\u01a1ng sai v\u00e0 \u0111\u1ed9 l\u1ec7ch chu\u1ea9n. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 h\u1ecdc qua v\u00ed d\u1ee5 th\u1ef1c t\u1ebf thay v\u00ec ch\u1ec9 ghi nh\u1edb c\u00f4ng th\u1ee9c.<\/p>\n
Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n d\u00f9ng \u0111\u1ec3 l\u00e0m g\u00ec trong cu\u1ed9c s\u1ed1ng?<\/h3>\n
Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n c\u00f3 r\u1ea5t nhi\u1ec1u \u1ee9ng d\u1ee5ng: t\u00ednh \u0111i\u1ec3m trung b\u00ecnh h\u1ecdc t\u1eadp, ph\u00e2n t\u00edch l\u01b0\u01a1ng th\u01b0\u1edfng, ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m, ph\u00e2n t\u00edch th\u1ecb tr\u01b0\u1eddng, \u0111\u1ecdc hi\u1ec3u b\u00e1o c\u00e1o t\u00e0i ch\u00ednh, nghi\u00ean c\u1ee9u khoa h\u1ecdc v\u00e0 y h\u1ecdc. B\u1ea5t k\u1ef3 ai l\u00e0m vi\u1ec7c v\u1edbi s\u1ed1 li\u1ec7u \u0111\u1ec1u c\u1ea7n th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n.<\/p>\n
S\u1ef1 kh\u00e1c nhau gi\u1eefa th\u1ed1ng k\u00ea m\u00f4 t\u1ea3 v\u00e0 th\u1ed1ng k\u00ea suy lu\u1eadn l\u00e0 g\u00ec?<\/h3>\n
Th\u1ed1ng k\u00ea m\u00f4 t\u1ea3 t\u00f3m t\u1eaft v\u00e0 m\u00f4 t\u1ea3 t\u1eadp d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 (v\u00ed d\u1ee5: \u0111i\u1ec3m trung b\u00ecnh c\u1ee7a l\u1edbp). Th\u1ed1ng k\u00ea suy lu\u1eadn d\u00f9ng m\u1eabu \u0111\u1ec3 \u0111\u01b0a ra k\u1ebft lu\u1eadn v\u1ec1 t\u1ed5ng th\u1ec3 r\u1ed9ng h\u01a1n (v\u00ed d\u1ee5: t\u1eeb 1.000 ng\u01b0\u1eddi \u0111\u01b0\u1ee3c kh\u1ea3o s\u00e1t, suy lu\u1eadn v\u1ec1 to\u00e0n b\u1ed9 d\u00e2n s\u1ed1). Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n ch\u1ee7 y\u1ebfu t\u1eadp trung v\u00e0o th\u1ed1ng k\u00ea m\u00f4 t\u1ea3.<\/p>\n
T\u00f4i c\u1ea7n h\u1ecdc ph\u1ea7n m\u1ec1m n\u00e0o \u0111\u1ec3 l\u00e0m th\u1ed1ng k\u00ea?<\/h3>\n
V\u1edbi th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n, b\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng Excel (h\u00e0m AVERAGE, MEDIAN, MODE, STDEV) ho\u1eb7c Google Sheets mi\u1ec5n ph\u00ed. Khi ti\u1ebfn xa h\u01a1n, R v\u00e0 Python (th\u01b0 vi\u1ec7n pandas, scipy) l\u00e0 l\u1ef1a ch\u1ecdn chuy\u00ean nghi\u1ec7p. V\u1edbi c\u00e1c t\u00ednh to\u00e1n \u0111\u01a1n gi\u1ea3n v\u1ec1 ph\u1ea7n tr\u0103m, b\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng c\u00f4ng c\u1ee5 tr\u1ef1c ti\u1ebfp t\u1ea1i 1phantram.com<\/a>.<\/p>\n
K\u1ebft Lu\u1eadn<\/h2>\n
Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n l\u00e0 k\u1ef9 n\u0103ng kh\u00f4ng th\u1ec3 thi\u1ebfu trong th\u1eddi \u0111\u1ea1i d\u1eef li\u1ec7u. N\u1eafm v\u1eefng c\u00e1c kh\u00e1i ni\u1ec7m t\u1eeb trung b\u00ecnh, trung v\u1ecb, mode \u0111\u1ebfn ph\u01b0\u01a1ng sai v\u00e0 t\u1ea7n su\u1ea5t s\u1ebd gi\u00fap b\u1ea1n \u0111\u1ecdc hi\u1ec3u s\u1ed1 li\u1ec7u, \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh d\u1ef1a tr\u00ean b\u1eb1ng ch\u1ee9ng v\u00e0 giao ti\u1ebfp hi\u1ec7u qu\u1ea3 h\u01a1n trong c\u00f4ng vi\u1ec7c.<\/p>\n
H\u00e3y b\u1eaft \u0111\u1ea7u t\u1eeb nh\u1eefng kh\u00e1i ni\u1ec7m \u0111\u01a1n gi\u1ea3n nh\u1ea5t, luy\u1ec7n t\u1eadp v\u1edbi d\u1eef li\u1ec7u th\u1ef1c t\u1ebf, v\u00e0 d\u1ea7n d\u1ea7n m\u1edf r\u1ed9ng ki\u1ebfn th\u1ee9c. Th\u1ed1ng k\u00ea kh\u00f4ng ph\u1ea3i m\u00f4n h\u1ecdc kh\u00f4 khan \u2014 \u0111\u00f3 l\u00e0 ng\u00f4n ng\u1eef c\u1ee7a d\u1eef li\u1ec7u trong th\u1ebf gi\u1edbi hi\u1ec7n \u0111\u1ea1i.<\/p>\n
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\ud83d\udcda Chu\u1ed7i B\u00e0i Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n \u2014 \u0110\u1ecdc Theo Th\u1ee9 T\u1ef1<\/h2>\n
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B\u00e0i n\u00e0y (Pillar):<\/strong> Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n \u2014 H\u01b0\u1edbng D\u1eabn To\u00e0n Di\u1ec7n T\u1eeb A-Z<\/li>\n
Trung B\u00ecnh C\u1ed9ng L\u00e0 G\u00ec?<\/strong><\/a> \u2014 C\u00f4ng th\u1ee9c, v\u00ed d\u1ee5 \u0111i\u1ec3m h\u1ecdc sinh, l\u01b0\u01a1ng, nhi\u1ec7t \u0111\u1ed9<\/li>\n
Trung V\u1ecb (Median) L\u00e0 G\u00ec?<\/strong><\/a> \u2014 C\u00e1ch t\u00ednh v\u00e0 khi n\u00e0o d\u00f9ng thay trung b\u00ecnh<\/li>\n
Mode (Y\u1ebfu V\u1ecb) L\u00e0 G\u00ec?<\/strong><\/a> \u2014 C\u00e1ch t\u00ecm, unimodal\/bimodal, \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf<\/li>\n
Ph\u01b0\u01a1ng Sai V\u00e0 \u0110\u1ed9 L\u1ec7ch Chu\u1ea9n<\/strong><\/a> \u2014 C\u00f4ng th\u1ee9c, quy t\u1eafc 68-95-99.7, \u0111\u00e1nh gi\u00e1 r\u1ee7i ro<\/li>\n
T\u1ea7n Su\u1ea5t V\u00e0 B\u1ea3ng T\u1ea7n S\u1ed1<\/strong><\/a> \u2014 C\u00e1ch l\u1eadp b\u1ea3ng t\u1ea7n s\u1ed1 v\u00e0 bi\u1ec3u \u0111\u1ed3 c\u1ed9t<\/li>\n
T\u1ec9 L\u1ec7 Ph\u1ea7n Tr\u0103m Trong Th\u1ed1ng K\u00ea<\/strong><\/a> \u2014 C\u00e1ch \u0111\u1ecdc v\u00e0 ph\u00e2n t\u00edch s\u1ed1 li\u1ec7u %<\/li>\n<\/ol>\n\ud83d\udd17 Tham kh\u1ea3o th\u00eam: H\u01b0\u1edbng d\u1eabn t\u00ednh ph\u1ea7n tr\u0103m to\u00e0n di\u1ec7n<\/strong><\/a> t\u1ea1i 1phantram.com<\/p>\n<\/div>\n
\ud83d\udd22 D\u00f9ng ngay c\u00f4ng c\u1ee5 t\u00ednh % t\u1ea1i 1phantram.com<\/a><\/strong> \u2014 T\u00ednh to\u00e1n nhanh c\u00e1c t\u1ec9 l\u1ec7 ph\u1ea7n tr\u0103m, ph\u1ee5c v\u1ee5 ph\u00e2n t\u00edch th\u1ed1ng k\u00ea h\u00e0ng ng\u00e0y c\u1ee7a b\u1ea1n!<\/p>\n\n\n
\ud83d\udcb0 \u1ee8ng d\u1ee5ng th\u1ed1ng k\u00ea v\u00e0o th\u1ef1c t\u1ebf: Qu\u1ea3n L\u00fd T\u00e0i Ch\u00ednh C\u00e1 Nh\u00e2n A-Z<\/a> \u2014 d\u00f9ng s\u1ed1 li\u1ec7u th\u1ed1ng k\u00ea \u0111\u1ec3 l\u1eadp ng\u00e2n s\u00e1ch v\u00e0 \u0111\u1ea7u t\u01b0 hi\u1ec7u qu\u1ea3.<\/p>\n","protected":false},"excerpt":{"rendered":"
Th\u1ed1ng k\u00ea c\u01a1 b\u1ea3n l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a m\u1ecdi ng\u00e0nh khoa h\u1ecdc, kinh doanh v\u00e0 nghi\u00ean c\u1ee9u hi\u1ec7n \u0111\u1ea1i. \u0110\u00e2y l\u00e0 t\u1eadp h\u1ee3p c\u00e1c ph\u01b0\u01a1ng…<\/p>\n","protected":false},"author":1,"featured_media":1056,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"","rank_math_description":"","rank_math_focus_keyword":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-36","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-huong-dan"],"_links":{"self":[{"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/posts\/36","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/comments?post=36"}],"version-history":[{"count":2,"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/posts\/36\/revisions"}],"predecessor-version":[{"id":97,"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/posts\/36\/revisions\/97"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/media\/1056"}],"wp:attachment":[{"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/media?parent=36"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/categories?post=36"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/1phantram.com\/blog\/wp-json\/wp\/v2\/tags?post=36"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

C\u00e1c Kh\u00e1i Ni\u1ec7m C\u1ed1t L\u00f5i Trong Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n<\/h2>\n

\u1ee8ng D\u1ee5ng Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n Trong Th\u1ef1c T\u1ebf<\/h2>\n

C\u00e1c L\u1ed7i Th\u01b0\u1eddng G\u1eb7p Khi H\u1ecdc Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n<\/h2>\n

C\u00e2u H\u1ecfi Th\u01b0\u1eddng G\u1eb7p (FAQ)<\/h2>\n

\ud83d\udcda Chu\u1ed7i B\u00e0i Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n \u2014 \u0110\u1ecdc Theo Th\u1ee9 T\u1ef1<\/h2>\n\nB\u00e0i n\u00e0y (Pillar):<\/strong> Th\u1ed1ng K\u00ea C\u01a1 B\u1ea3n \u2014 H\u01b0\u1edbng D\u1eabn To\u00e0n Di\u1ec7n T\u1eeb A-Z<\/li>\n