{"id":3060,"date":"2026-10-12T08:00:00","date_gmt":"2026-10-12T01:00:00","guid":{"rendered":"https:\/\/dykhoa.com\/blog\/?post_type=thuat_ngu&amp;p=3059"},"modified":"2026-10-12T08:00:00","modified_gmt":"2026-10-12T01:00:00","slug":"co-mau-nghien-cuu-sample-size","status":"publish","type":"thuat_ngu","link":"https:\/\/dykhoa.com\/blog\/thuat-ngu\/co-mau-nghien-cuu-sample-size\/","title":{"rendered":"C\u1ee1 m\u1eabu nghi\u00ean c\u1ee9u (sample size) l\u00e0 g\u00ec?"},"content":{"rendered":"<p>M\u1ed9t k\u1ebft lu\u1eadn khoa h\u1ecdc kh\u00f4ng th\u1ec3 \u0111\u00e1ng tin c\u1eady n\u1ebfu nghi\u00ean c\u1ee9u ch\u1ec9 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean c\u1ee1 m\u1eabu qu\u00e1 nh\u1ecf (Kadam &#038; Bhalerao, 2010). Xem b\u00e0i <a href=\"https:\/\/dykhoa.com\/blog\/blog\/kiem-tra-nghien-cuu-chia-se-tren-mang\/\">Ki\u1ec3m tra nghi\u00ean c\u1ee9u chia s\u1ebb tr\u00ean m\u1ea1ng<\/a>.<\/p>\n<h2>S\u1ee9c m\u1ea1nh th\u1ed1ng k\u00ea (Statistical power)<\/h2>\n<p>T\u00ednh to\u00e1n c\u1ee1 m\u1eabu tr\u01b0\u1edbc nghi\u00ean c\u1ee9u (Power analysis) gi\u00fap x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng b\u1ec7nh nh\u00e2n t\u1ed1i thi\u1ec3u c\u1ea7n tuy\u1ec3n \u0111\u1ec3 c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 kh\u00e1c bi\u1ec7t c\u00f3 \u00fd ngh\u0129a l\u00e2m s\u00e0ng v\u1edbi \u0111\u1ed9 tin c\u1eady th\u01b0\u1eddng l\u00e0 80%.<\/p>\n<h2>Hi\u1ec3m h\u1ecda c\u1ee7a c\u1ee1 m\u1eabu nh\u1ecf (Small sample fallacy)<\/h2>\n<p>C\u1ee1 m\u1eabu 10 ng\u01b0\u1eddi th\u1eed nghi\u1ec7m thu\u1ed1c d\u1ec5 d\u00e0ng t\u1ea1o ra k\u1ebft qu\u1ea3 gi\u1ea3 m\u1ea1o do bi\u1ebfn thi\u00ean ng\u1eabu nhi\u00ean, khi\u1ebfn c\u00e1c ph\u00e1t hi\u1ec7n kh\u00f4ng th\u1ec3 t\u00e1i l\u1eadp trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u1ee1 m\u1eabu l\u00e0 s\u1ed1 l\u01b0\u1ee3ng \u0111\u01a1n v\u1ecb ho\u1eb7c c\u00e1 th\u1ec3 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn t\u1eeb m\u1ed9t qu\u1ea7n th\u1ec3 d\u00e2n s\u1ed1 m\u1ee5c ti\u00eau \u0111\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u trong m\u1ed9t nghi\u00ean c\u1ee9u khoa h\u1ecdc.<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","nhom_thuat_ngu":[476],"class_list":["post-3060","thuat_ngu","type-thuat_ngu","status-publish","hentry","nhom_thuat_ngu-nghien-cuu-bang-chung"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C\u1ee1 m\u1eabu nghi\u00ean c\u1ee9u (sample size) l\u00e0 g\u00ec? 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