{"id":1378,"date":"2021-05-28T14:07:46","date_gmt":"2021-05-28T14:07:46","guid":{"rendered":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/?p=1378"},"modified":"2026-04-08T14:50:39","modified_gmt":"2026-04-08T07:50:39","slug":"null-hypothesis-la-gi-khac-gi-voi-alternative-hypothesis","status":"publish","type":"post","link":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/kien-thuc-kinh-te\/null-hypothesis-la-gi-khac-gi-voi-alternative-hypothesis","title":{"rendered":"Null hypothesis l\u00e0 g\u00ec, kh\u00e1c g\u00ec v\u1edbi alternative hypothesis?"},"content":{"rendered":"\n

Gi\u1ea3 thuy\u1ebft r\u1ed7ng Null hypothesis l\u00e0 g\u00ec?<\/strong> S\u1ef1 kh\u00e1c nhau gi\u1eefa gi\u1ea3 thuy\u1ebft r\u1ed7ng v\u00e0 gi\u1ea3 thuy\u1ebft thay th\u1ebf l\u00e0 g\u00ec? H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u ngay sau \u0111\u00e2y nh\u00e9.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Gi\u1ea3 thuy\u1ebft r\u1ed7ng null hypothesis l\u00e0 g\u00ec?<\/strong><\/h2>\n\n\n\n

Gi\u1ea3 thuy\u1ebft l\u00e0 m\u1ed9t suy \u0111o\u00e1n kh\u00f4ng \u0111\u1ee7 b\u1eb1ng ch\u1ee9ng, c\u1ea7n thi\u1ebft \u0111\u1ec3 ki\u1ec3m tra v\u00e0 th\u1eed nghi\u1ec7m th\u00eam. V\u1edbi th\u1eed nghi\u1ec7m s\u00e2u h\u01a1n, m\u1ed9t gi\u1ea3 thuy\u1ebft th\u01b0\u1eddng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh l\u00e0 \u0111\u00fang ho\u1eb7c sai.<\/p>\n\n\n\n

Gi\u1ea3 thuy\u1ebft r\u1ed7ng cho th\u1ea5y r\u1eb1ng kh\u00f4ng c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea trong m\u1ed9t t\u1eadp h\u1ee3p nh\u1ea5t \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y ng\u1ee5 \u00fd r\u1eb1ng b\u1ea5t k\u1ef3 lo\u1ea1i sai l\u1ec7ch ho\u1eb7c m\u1ee9c \u0111\u1ed9 quan tr\u1ecdng n\u00e0o b\u1ea1n th\u1ea5y trong t\u1eadp d\u1eef li\u1ec7u ch\u1ec9 l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a s\u1ef1 may r\u1ee7i. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c coi l\u00e0 \u0111\u00fang cho \u0111\u1ebfn khi b\u1eb1ng ch\u1ee9ng ph\u00e2n t\u00edch ch\u1ee9ng minh n\u00f3 sai v\u00e0 thay th\u1ebf n\u00f3 b\u1eb1ng m\u1ed9t gi\u1ea3 thuy\u1ebft kh\u00e1c.<\/p>\n\n\n\n

H\u00e3y xem m\u1ed9t v\u00ed d\u1ee5: B\u1ea1n suy \u0111o\u00e1n ho\u1eb7c \u0111\u01b0a ra gi\u1ea3 thuy\u1ebft r\u1eb1ng nh\u1eefng ch\u1eadu b\u00f4ng m\u00e0 b\u1ea1n t\u01b0\u1edbi b\u1eb1ng n\u01b0\u1edbc soda s\u1ebd l\u1edbn nhanh h\u01a1n nh\u1eefng ch\u1eadu t\u01b0\u1edbi b\u1eb1ng n\u01b0\u1edbc l\u00e3. B\u1ea1n t\u01b0\u1edbi n\u01b0\u1edbc cho m\u1ed7i c\u00e2y h\u00e0ng ng\u00e0y trong m\u1ed9t th\u00e1ng (th\u00ed nghi\u1ec7m) v\u00e0 ch\u1ee9ng minh gi\u1ea3 thuy\u1ebft c\u1ee7a m\u00ecnh l\u00e0 \u0111\u00fang!<\/p>\n\n\n\n

Gi\u1ea3 thuy\u1ebft r\u1ed7ng l\u00e0 gi\u1ea3 thuy\u1ebft n\u00f3i r\u1eb1ng kh\u00f4ng c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea gi\u1eefa hai bi\u1ebfn trong gi\u1ea3 thuy\u1ebft. \u0110\u00f3 l\u00e0 gi\u1ea3 thuy\u1ebft m\u00e0 nh\u00e0 nghi\u00ean c\u1ee9u \u0111ang c\u1ed1 g\u1eafng b\u00e1c b\u1ecf.<\/p>\n\n\n\n

Trong v\u00ed d\u1ee5, gi\u1ea3 thuy\u1ebft r\u1ed7ng c\u1ee7a b\u1ea1n s\u1ebd nh\u01b0 th\u1ebf n\u00e0y: Kh\u00f4ng c\u00f3 m\u1ed1i quan h\u1ec7 c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea gi\u1eefa lo\u1ea1i n\u01b0\u1edbc b\u1ea1n cung c\u1ea5p cho hoa v\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a hoa. M\u1ed9t nh\u00e0 nghi\u00ean c\u1ee9u b\u1ecb th\u00e1ch th\u1ee9c b\u1edfi gi\u1ea3 thuy\u1ebft r\u1ed7ng v\u00e0 th\u01b0\u1eddng mu\u1ed1n b\u00e1c b\u1ecf n\u00f3, \u0111\u1ec3 ch\u1ee9ng minh r\u1eb1ng c\u00f3 m\u1ed1i quan h\u1ec7 c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea gi\u1eefa hai bi\u1ebfn trong gi\u1ea3 thuy\u1ebft.<\/p>\n\n\n\n

\n

Gi\u1ea3 thuy\u1ebft r\u1ed7ng l\u00e0 gi\u1ea3 thuy\u1ebft c\u00f3 gi\u00e1 tr\u1ecb nh\u1ea5t \u0111\u1ed1i v\u1edbi ph\u01b0\u01a1ng ph\u00e1p khoa h\u1ecdc v\u00ec n\u00f3 l\u00e0 gi\u1ea3 thuy\u1ebft d\u1ec5 ki\u1ec3m tra nh\u1ea5t b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ph\u00e2n t\u00edch th\u1ed1ng k\u00ea.<\/strong><\/em><\/p>\n<\/blockquote>\n\n\n\n

Gi\u1ea3 thuy\u1ebft thay th\u1ebf l\u00e0 g\u00ec?<\/strong><\/h2>\n\n\n\n

M\u1ed9t gi\u1ea3 thuy\u1ebft thay th\u1ebf ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 ngh\u1ecbch \u0111\u1ea3o, ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i c\u1ee7a gi\u1ea3 thuy\u1ebft r\u1ed7ng. V\u00ec v\u1eady, n\u1ebfu ch\u00fang ta ti\u1ebfp t\u1ee5c v\u1edbi v\u00ed d\u1ee5 tr\u00ean, gi\u1ea3 thuy\u1ebft thay th\u1ebf s\u1ebd l\u00e0 th\u1ef1c s\u1ef1 c\u00f3 m\u1ed9t m\u1ed1i quan h\u1ec7 c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea gi\u1eefa lo\u1ea1i n\u01b0\u1edbc m\u00e0 c\u00e2y hoa \u0111\u01b0\u1ee3c cung c\u1ea5p v\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n. C\u1ee5 th\u1ec3 h\u01a1n, \u0111\u00e2y s\u1ebd l\u00e0 gi\u1ea3 thuy\u1ebft v\u00f4 hi\u1ec7u v\u00e0 gi\u1ea3 thuy\u1ebft thay th\u1ebf cho nghi\u00ean c\u1ee9u c\u1ee7a b\u1ea1n:<\/p>\n\n\n\n

Ki\u1ec3m \u0111\u1ecbnh gi\u1ea3 thuy\u1ebft l\u00e0 k\u1ef9 n\u0103ng quan tr\u1ecdng trong ph\u00e2n t\u00edch d\u1eef li\u1ec7u \u2014 nhi\u1ec1u v\u1ecb tr\u00ed Data Analyst \u0111\u01b0\u1ee3c \u0111\u0103ng t\u1ea1i chuy\u00ean m\u1ee5c vi\u1ec7c l\u00e0m CNTT ph\u1ea7n m\u1ec1m<\/a> tr\u00ean CareerLink.<\/p>\n\n\n\n

Gi\u1ea3 thuy\u1ebft r\u1ed7ng: N\u1ebfu m\u1ed9t c\u00e2y \u0111\u01b0\u1ee3c t\u01b0\u1edbi b\u1eb1ng n\u01b0\u1edbc ng\u1ecdt c\u00f3 ga trong m\u1ed9t th\u00e1ng v\u00e0 c\u00e2y kh\u00e1c \u0111\u01b0\u1ee3c t\u01b0\u1edbi n\u01b0\u1edbc b\u00ecnh th\u01b0\u1eddng, s\u1ebd kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 t\u1ed1c \u0111\u1ed9 ph\u00e1t tri\u1ec3n gi\u1eefa hai c\u00e2y.<\/p>\n\n\n\n

Gi\u1ea3 thuy\u1ebft thay th\u1ebf: N\u1ebfu m\u1ed9t c\u00e2y \u0111\u01b0\u1ee3c t\u01b0\u1edbi b\u1eb1ng n\u01b0\u1edbc ng\u1ecdt c\u00f3 ga trong m\u1ed9t th\u00e1ng v\u00e0 c\u00e2y kh\u00e1c \u0111\u01b0\u1ee3c t\u01b0\u1edbi n\u01b0\u1edbc th\u01b0\u1eddng, c\u00e2y \u0111\u01b0\u1ee3c t\u01b0\u1edbi b\u1eb1ng n\u01b0\u1edbc ng\u1ecdt s\u1ebd ph\u00e1t tri\u1ec3n t\u1ed1t h\u01a1n c\u00e2y \u0111\u01b0\u1ee3c t\u01b0\u1edbi n\u01b0\u1edbc th\u01b0\u1eddng.<\/p>\n\n\n\n

Null hyphothesis trong l\u0129nh v\u1ef1c \u0111\u1ea7u t\u01b0<\/strong><\/h2>\n\n\n\n

Trong l\u0129nh v\u1ef1c \u0111\u1ea7u t\u01b0, \u00fd ngh\u0129a c\u1ee7a null hypothesis l\u00e0 g\u00ec?<\/p>\n\n\n\n

\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n c\u00e1ch doanh nghi\u1ec7p \u1ee9ng d\u1ee5ng d\u1eef li\u1ec7u v\u00e0o ra quy\u1ebft \u0111\u1ecbnh, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc th\u00eam b\u00e0i Data Driven l\u00e0 g\u00ec<\/a> tr\u00ean CareerLink.<\/p>\n\n\n\n

Trong th\u1ebf gi\u1edbi t\u00e0i ch\u00ednh v\u00e0 \u0111\u1ea7u t\u01b0, ki\u1ec3m tra gi\u1ea3 thuy\u1ebft \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 xem x\u00e9t m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c y\u1ebfu t\u1ed1 c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn l\u1ee3i nhu\u1eadn ho\u1eb7c hi\u1ec7u su\u1ea5t. Gi\u1ea3 thuy\u1ebft r\u1ed7ng cho r\u1eb1ng k\u1ebft qu\u1ea3 l\u00e0 ng\u1eabu nhi\u00ean, trong khi c\u00e1c nh\u00e0 \u0111\u1ea7u t\u01b0 t\u00ecm ki\u1ebfm m\u1ed1i quan h\u1ec7 m\u00e0 n\u1ebfu \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n.<\/p>\n\n\n\n

V\u00ed d\u1ee5: gi\u1ea3 thuy\u1ebft r\u1ed7ng c\u1ee7a m\u1ed9t nh\u00e0 \u0111\u1ea7u t\u01b0 c\u00f3 th\u1ec3 l\u00e0: C\u1ed5 phi\u1ebfu trong ch\u1ec9 s\u1ed1 S&P 500 c\u00f3 h\u1ec7 s\u1ed1 P \/ E tr\u00ean 20 s\u1ebd kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 l\u1ee3i nhu\u1eadn h\u00e0ng n\u0103m nh\u01b0 c\u00e1c c\u1ed5 phi\u1ebfu trong ch\u1ec9 s\u1ed1 S&P 500 c\u00f3 h\u1ec7 s\u1ed1 PE d\u01b0\u1edbi 20.<\/p>\n\n\n\n

\u0110i\u1ec1u n\u00e0y t\u1ea1o c\u01a1 h\u1ed9i cho m\u1ed9t nh\u00e0 ph\u00e2n t\u00edch ho\u1eb7c nh\u00e0 \u0111\u1ea7u t\u01b0 kh\u00e1c b\u00e1c b\u1ecf gi\u1ea3 thuy\u1ebft v\u00f4 r\u1ed7ng n\u00e0y \u0111\u1ec3 h\u00ecnh th\u00e0nh m\u1ed9t gi\u1ea3 thuy\u1ebft thay th\u1ebf.<\/p>\n\n\n\n

V\u00ed d\u1ee5, m\u1ed9t gi\u1ea3 thuy\u1ebft thay th\u1ebf cho \u0111i\u1ec1u n\u00e0y s\u1ebd l\u00e0: C\u00e1c c\u1ed5 phi\u1ebfu trong ch\u1ec9 s\u1ed1 S&P 500 c\u00f3 h\u1ec7 s\u1ed1 P\/E tr\u00ean 20 s\u1ebd \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i nhu\u1eadn h\u00e0ng n\u0103m cao h\u01a1n c\u00e1c c\u1ed5 phi\u1ebfu trong ch\u1ec9 s\u1ed1 S&P 500 c\u00f3 h\u1ec7 s\u1ed1 P\/E d\u01b0\u1edbi 20.<\/p>\n\n\n\n

C\u00e1c b\u01b0\u1edbc ki\u1ec3m tra gi\u1ea3 thuy\u1ebft<\/strong><\/h3>\n\n\n\n

C\u00e1c nh\u00e0 kinh t\u1ebf l\u01b0\u1ee3ng tu\u00e2n theo m\u1ed9t quy tr\u00ecnh ch\u00ednh th\u1ee9c \u0111\u1ec3 ki\u1ec3m tra m\u1ed9t gi\u1ea3 thuy\u1ebft v\u00e0 x\u00e1c \u0111\u1ecbnh xem n\u00f3 c\u00f3 b\u1ecb b\u00e1c b\u1ecf hay kh\u00f4ng. C\u00e1c b\u01b0\u1edbc bao g\u1ed3m:<\/p>\n\n\n\n

N\u00eau c\u00e1c gi\u1ea3 thuy\u1ebft<\/strong><\/h3>\n\n\n\n

B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean li\u00ean quan \u0111\u1ebfn vi\u1ec7c \u0111\u1ecbnh v\u1ecb c\u00e1c gi\u1ea3 thuy\u1ebft r\u1ed7ng v\u00e0 gi\u1ea3 thuy\u1ebft thay th\u1ebf. H\u00e3y nh\u1edb r\u1eb1ng ch\u00fang lo\u1ea1i tr\u1eeb l\u1eabn nhau. N\u1ebfu m\u1ed9t gi\u1ea3 thuy\u1ebft n\u00eau m\u1ed9t s\u1ef1 th\u1eadt, th\u00ec gi\u1ea3 thuy\u1ebft kia ph\u1ea3i b\u00e1c b\u1ecf n\u00f3.<\/p>\n\n\n\n

\u0110\u01b0a ra c\u00e1c gi\u1ea3 \u0111\u1ecbnh th\u1ed1ng k\u00ea<\/strong><\/h3>\n\n\n\n

Xem x\u00e9t c\u00e1c gi\u1ea3 \u0111\u1ecbnh th\u1ed1ng k\u00ea \u2013 ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00ednh \u0111\u1ed9c l\u1eadp c\u1ee7a c\u00e1c \u0111i\u1ec1u nh\u1eadn th\u1ea5y v\u1edbi nhau, t\u00ednh b\u00ecnh th\u01b0\u1eddng c\u1ee7a \u0111i\u1ec1u nh\u1eadn th\u1ea5y, sai s\u1ed1 ng\u1eabu nhi\u00ean v\u00e0 ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t c\u1ee7a sai s\u1ed1 ng\u1eabu nhi\u00ean, ng\u1eabu nhi\u00ean h\u00f3a trong qu\u00e1 tr\u00ecnh l\u1ea5y m\u1eabu\u2026<\/p>\n\n\n\n

L\u1eadp k\u1ebf ho\u1ea1ch ph\u00e2n t\u00edch<\/strong><\/h3>\n\n\n\n

\u0110i\u1ec1u n\u00e0y bao g\u1ed3m vi\u1ec7c quy\u1ebft \u0111\u1ecbnh th\u1eed nghi\u1ec7m s\u1ebd \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ec3 ki\u1ec3m tra gi\u1ea3 thuy\u1ebft. \u0110\u1ed3ng th\u1eddi, ch\u00fang ta c\u1ea7n quy\u1ebft \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u m\u1eabu s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra gi\u1ea3 thuy\u1ebft r\u1ed7ng.<\/p>\n\n\n\n

\u0110i\u1ec1u tra d\u1eef li\u1ec7u m\u1eabu<\/strong><\/h3>\n\n\n\n

\u1ede giai \u0111o\u1ea1n n\u00e0y, d\u1eef li\u1ec7u m\u1eabu \u0111\u01b0\u1ee3c ki\u1ec3m tra. \u0110\u00f3 l\u00e0 khi ch\u00fang ta t\u00ecm th\u1ea5y \u0111i\u1ec3m \u2013 gi\u00e1 tr\u1ecb trung b\u00ecnh, ph\u00e2n ph\u1ed1i chu\u1ea9n, ph\u00e2n ph\u1ed1i t, \u0111i\u1ec3m z\u2026<\/p>\n\n\n\n

Di\u1ec5n gi\u1ea3i k\u1ebft qu\u1ea3<\/strong><\/h3>\n\n\n\n

Giai \u0111o\u1ea1n n\u00e0y li\u00ean quan \u0111\u1ebfn vi\u1ec7c \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh b\u00e1c b\u1ecf gi\u1ea3 thuy\u1ebft v\u00f4 hi\u1ec7u \u0111\u1ec3 \u1ee7ng h\u1ed9 gi\u1ea3 thuy\u1ebft thay th\u1ebf ho\u1eb7c kh\u00f4ng b\u00e1c b\u1ecf gi\u1ea3 thuy\u1ebft r\u1ed7ng.<\/p>\n\n\n\n

Ch\u1ea5p nh\u1eadn ho\u1eb7c b\u00e1c b\u1ecf gi\u1ea3 thuy\u1ebft r\u1ed7ng<\/strong><\/h3>\n\n\n\n

\u0110\u00e2y l\u00e0 ph\u1ea7n m\u1edf r\u1ed9ng c\u1ee7a b\u01b0\u1edbc cu\u1ed1i c\u00f9ng \u2013 gi\u1ea3i th\u00edch k\u1ebft qu\u1ea3 trong qu\u00e1 tr\u00ecnh ki\u1ec3m tra gi\u1ea3 thuy\u1ebft. Gi\u1ea3 thuy\u1ebft r\u1ed7ng \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn ho\u1eb7c b\u1ecb b\u00e1c b\u1ecf Gi\u00e1 tr\u1ecb P c\u01a1 s\u1edf v\u00e0 v\u00f9ng ch\u1ea5p nh\u1eadn.<\/p>\n\n\n\n

Gi\u00e1 tr\u1ecb P \u2013 n\u00f3 l\u00e0 m\u1ed9t h\u00e0m c\u1ee7a k\u1ebft qu\u1ea3 m\u1eabu quan s\u00e1t \u0111\u01b0\u1ee3c. Gi\u00e1 tr\u1ecb ng\u01b0\u1ee1ng \u0111\u01b0\u1ee3c ch\u1ecdn tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh th\u1eed nghi\u1ec7m v\u00e0 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ee9c \u00fd ngh\u0129a, \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng \u03b1. N\u1ebfu gi\u00e1 tr\u1ecb t\u00ednh to\u00e1n c\u1ee7a P \u2264 \u03b1, n\u00f3 cho th\u1ea5y s\u1ef1 m\u00e2u thu\u1eabn gi\u1eefa d\u1eef li\u1ec7u nh\u1eadn th\u1ea5y \u0111\u01b0\u1ee3c v\u00e0 gi\u1ea3 thi\u1ebft r\u1eb1ng gi\u1ea3 thuy\u1ebft r\u1ed7ng l\u00e0 \u0111\u00fang.<\/p>\n\n\n\n

\u0110i\u1ec1u n\u00e0y cho th\u1ea5y gi\u1ea3 thuy\u1ebft r\u1ed7ng ph\u1ea3i b\u1ecb b\u00e1c b\u1ecf. Tuy nhi\u00ean, \u0111i\u1ec1u n\u00e0y kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 gi\u1ea3 thuy\u1ebft thay th\u1ebf c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn l\u00e0 \u0111\u00fang.<\/p>\n\n\n\n

V\u00ed d\u1ee5: B\u1ea1n tung m\u1ed9t c\u1eb7p x\u00fac x\u1eafc m\u1ed9t l\u1ea7n v\u00e0 cho r\u1eb1ng ch\u00fang l\u00e0 c\u00f4ng b\u1eb1ng v\u00e0 do \u0111\u00f3 k\u1ebft qu\u1ea3 hi\u1ec3n th\u1ecb khi tung x\u00fac x\u1eafc s\u1ebd c\u00f4ng b\u1eb1ng.<\/p>\n\n\n\n

Gi\u1ea3 thuy\u1ebft v\u00f4 hi\u1ec7u l\u00e0 \u2013 x\u00fac x\u1eafc l\u00e0 c\u00f4ng b\u1eb1ng. B\u1ea1n \u0111\u00e3 gi\u1ea3 \u0111\u1ecbnh m\u1ee9c \u00fd ngh\u0129a (\u03b1) l\u00e0 0,04.<\/p>\n\n\n\n

B\u00e2y gi\u1edd b\u1ea1n tung x\u00fac x\u1eafc v\u00e0 quan s\u00e1t r\u1eb1ng c\u1ea3 hai \u0111\u1ec1u hi\u1ec3n th\u1ecb 6. Gi\u00e1 tr\u1ecb p s\u1ebd l\u00e0 1\/36 ho\u1eb7c 1 \/ (6 * 6) gi\u1ea3 s\u1eed r\u1eb1ng t\u0129nh th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1 \u0111\u1ed3ng \u0111\u1ec1u. Gi\u00e1 tr\u1ecb p l\u00e0 0,028 nh\u1ecf h\u01a1n gi\u00e1 tr\u1ecb gi\u1ea3 \u0111\u1ecbnh c\u1ee7a \u03b1. Tr\u00ean c\u01a1 s\u1edf n\u00e0y, gi\u1ea3 thuy\u1ebft r\u1ed7ng b\u1ecb b\u00e1c b\u1ecf. N\u00f3 cho th\u1ea5y r\u1eb1ng gi\u1ea3 \u0111\u1ecbnh cho r\u1eb1ng x\u00fac x\u1eafc c\u00f4ng b\u1eb1ng l\u00e0 kh\u00f4ng \u0111\u00fang.<\/p>\n\n\n\n

V\u00f9ng ch\u1ea5p nh\u1eadn \u2013 \u0110\u00f3 l\u00e0 ph\u1ea1m vi gi\u00e1 tr\u1ecb khi\u1ebfn b\u1ea1n ch\u1ea5p nh\u1eadn gi\u1ea3 thuy\u1ebft v\u00f4 hi\u1ec7u. Khi b\u1ea1n thu th\u1eadp v\u00e0 quan s\u00e1t d\u1eef li\u1ec7u m\u1eabu, b\u1ea1n s\u1ebd t\u00ednh to\u00e1n th\u1eed nghi\u1ec7m t\u0129nh. N\u1ebfu gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 n\u1eb1m trong ph\u1ea1m vi c\u1ee5 th\u1ec3 th\u00ec gi\u1ea3 thuy\u1ebft r\u1ed7ng \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn.<\/p>\n\n\n\n

V\u00ed d\u1ee5: B\u1ea1n c\u00f3 th\u1ec3 gi\u1ea3 thuy\u1ebft r\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng trung b\u00ecnh c\u1ee7a h\u1ecdc sinh trong m\u1ed9t tr\u01b0\u1eddng h\u1ecdc l\u00e0 30 kg. \u0110\u1ec3 ki\u1ec3m tra gi\u1ea3 thuy\u1ebft n\u00e0y, b\u1ea1n thu th\u1eadp m\u1ed9t m\u1eabu ng\u1eabu nhi\u00ean v\u00e0 t\u00ednh \u0111i\u1ec3m trung b\u00ecnh.<\/p>\n\n\n\n

N\u1ebfu gi\u00e1 tr\u1ecb trung b\u00ecnh c\u1ee7a m\u1eabu g\u1ea7n v\u1edbi gi\u00e1 tr\u1ecb trung b\u00ecnh \u0111\u01b0\u1ee3c gi\u1ea3 thuy\u1ebft, gi\u1ea3 s\u1eed trong kho\u1ea3ng t\u1eeb 29 \u0111\u1ebfn 31, b\u1ea1n ch\u1ea5p nh\u1eadn gi\u1ea3 thuy\u1ebft r\u1ed7ng. Do \u0111\u00f3, v\u00f9ng ch\u1ea5p nh\u1eadn l\u00e0 29 v\u00e0 31. C\u00e1c gi\u00e1 tr\u1ecb n\u1eb1m ngo\u00e0i v\u00f9ng n\u00e0y s\u1ebd n\u1eb1m trong v\u00f9ng t\u1eeb ch\u1ed1i.<\/p>\n\n\n\n

Null hypothesis l\u00e0 g\u00ec v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch tr\u00ean \u0111\u00e2y, hi v\u1ecdng r\u1eb1ng \u0111\u00e3 gi\u1ea3i \u0111\u00e1p \u0111\u01b0\u1ee3c th\u1eafc m\u1eafc c\u1ee7a b\u1ea1n.<\/p>\n\n\n\n

Hu\u1ef3nh Tr\u00e2m<\/strong><\/p>\n\n\n\n

<\/p>\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

Gi\u1ea3 thuy\u1ebft r\u1ed7ng Null hypothesis l\u00e0 g\u00ec? S\u1ef1 kh\u00e1c nhau gi\u1eefa gi\u1ea3 thuy\u1ebft r\u1ed7ng v\u00e0 gi\u1ea3 thuy\u1ebft thay th\u1ebf l\u00e0 g\u00ec? H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u …<\/p>\n","protected":false},"author":58,"featured_media":16559,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-1378","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kien-thuc-kinh-te"],"_links":{"self":[{"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/posts\/1378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/users\/58"}],"replies":[{"embeddable":true,"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/comments?post=1378"}],"version-history":[{"count":5,"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/posts\/1378\/revisions"}],"predecessor-version":[{"id":16560,"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/posts\/1378\/revisions\/16560"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/media\/16559"}],"wp:attachment":[{"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/media?parent=1378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/categories?post=1378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mb668s.com\/cam-nang-7mb66-xoc-dia\/wp-json\/wp\/v2\/tags?post=1378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}