{"id":525,"date":"2023-07-29T14:56:51","date_gmt":"2023-07-29T14:56:51","guid":{"rendered":"https:\/\/statorials.org\/ko\/%e1%84%8b%e1%85%b0%e1%86%af%e1%84%8e%e1%85%b5%e1%84%89%e1%85%b3-t-%e1%84%90%e1%85%a6%e1%84%89%e1%85%b3%e1%84%90%e1%85%b3\/"},"modified":"2023-07-29T14:56:51","modified_gmt":"2023-07-29T14:56:51","slug":"%e1%84%8b%e1%85%b0%e1%86%af%e1%84%8e%e1%85%b5%e1%84%89%e1%85%b3-t-%e1%84%90%e1%85%a6%e1%84%89%e1%85%b3%e1%84%90%e1%85%b3","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/%e1%84%8b%e1%85%b0%e1%86%af%e1%84%8e%e1%85%b5%e1%84%89%e1%85%b3-t-%e1%84%90%e1%85%a6%e1%84%89%e1%85%b3%e1%84%90%e1%85%b3\/","title":{"rendered":"Welch\uc758 t \uac80\uc815: \uc0ac\uc6a9 \uc2dc\uae30 + \uc608"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\ub450 \uac1c\uc758 \ub3c5\ub9bd\uc801\uc778 \uadf8\ub8f9\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud558\ub824\ub294 \uacbd\uc6b0 \ub450 \uac00\uc9c0 \ub2e4\ub978 \ud14c\uc2a4\ud2b8 \uc0ac\uc6a9 \uc911\uc5d0\uc11c \uc120\ud0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>\uc2a4\ud29c\ub358\ud2b8 t-\uac80\uc815:<\/strong> \uc774 \uac80\uc815\uc740 \ub450 \ub370\uc774\ud130 \uadf8\ub8f9\uc774 \uc815\uaddc \ubd84\ud3ec\ub97c \ub530\ub974\ub294 \ubaa8\uc9d1\ub2e8\uc5d0\uc11c \uc0d8\ud50c\ub9c1\ub418\uace0 \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c\ud558\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Welch\uc758 t-\uac80\uc815:<\/strong> \uc774 \uac80\uc815\uc5d0\uc11c\ub294 \ub450 \ub370\uc774\ud130 \uadf8\ub8f9\uc774 \ubaa8\ub450 \uc815\uaddc \ubd84\ud3ec\ub97c \ub530\ub974\ub294 \ubaa8\uc9d1\ub2e8\uc5d0\uc11c \uc0d8\ud50c\ub9c1\ub418\uc5c8\ub2e4\uace0 \uac00\uc815 <em>\ud558\uc9c0\ub9cc \uc774 \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c\ud558\ub2e4\uace0 \uac00\uc815\ud558\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4<\/em> .<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Student&#8217;s t-test\uc640 Welch&#8217;s t-test\uc758 \ucc28\uc774\uc810<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">\uc2a4\ud29c\ub358\ud2b8 t-\ud14c\uc2a4\ud2b8\uc640 Welch\uc758 t-\ud14c\uc2a4\ud2b8 \uc218\ud589 \ubc29\ubc95\uc5d0\ub294 \ub450 \uac00\uc9c0 \ucc28\uc774\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><span style=\"color: #000000;\"><strong>\ud14c\uc2a4\ud2b8 \ud1b5\uacc4<\/strong><\/span><\/span><\/li>\n<li> <span style=\"color: #000000;\"><span style=\"color: #000000;\"><strong>\uc790\uc720\ub3c4<\/strong><\/span><\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>\ud559\uc0dd\uc758 t-\ud14c\uc2a4\ud2b8:<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\"><strong>\uac80\uc815 \ud1b5\uacc4\ub7c9:<\/strong> ( <span style=\"border-top: 1px solid black;\">x<\/span> <sub>1<\/sub> \u2013 <span style=\"border-top: 1px solid black;\">x<\/span> <sub>2<\/sub> ) \/ s <sub>p<\/sub> (\u221a <span style=\"border-top: 1px solid black;\">1\/n <sub>1<\/sub> + 1\/n <sub>2<\/sub><\/span> )<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc5ec\uae30\uc11c <span style=\"border-top: 1px solid black;\">x<\/span> <sub>1<\/sub> \uacfc <span style=\"border-top: 1px solid black;\">x<\/span> <sub>2<\/sub> \ub294 \ud45c\ubcf8 \ud3c9\uade0\uc774\uace0, n <sub>1<\/sub> \uacfc n <sub>2<\/sub> \ub294 \uac01\uac01 \ud45c\ubcf8 1\uacfc \ud45c\ubcf8 2\uc5d0 \ub300\ud55c \ud45c\ubcf8 \ud06c\uae30\uc774\uba70, s <sub>p<\/sub> \ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \uacc4\uc0b0\ub429\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">s <sub>p<\/sub><\/span> = <span style=\"color: #000000;\">\u221a <span style=\"border-top: 1px solid black;\">(n <sub>1<\/sub> -1)s <sub>1<\/sub> <sup>2<\/sup> + (n <sub>2<\/sub> -1)s <sub>2<\/sub> <sup>2<\/sup> \/ (n <sub>1<\/sub> +n <sub>2<\/sub> -2)<\/span><\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc5ec\uae30\uc11c s <sub>1<\/sub> <sup>2<\/sup> \ubc0f s <sub>2<\/sub> <sup>2<\/sup> \ub294 \ud45c\ubcf8 \ubd84\uc0b0\uc785\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>\uc790\uc720\ub3c4:<\/strong> n <sub>1<\/sub> + n <sub>2<\/sub> \u2013 2<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>\uc6f0\uce58\uc758 T-\uac80\uc815<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\"><strong>\uac80\uc815 \ud1b5\uacc4\ub7c9:<\/strong> ( <span style=\"border-top: 1px solid black;\">x<\/span> <sub>1<\/sub> \u2013 <span style=\"border-top: 1px solid black;\">x<\/span> <sub>2<\/sub> ) \/ (\u221a <span style=\"border-top: 1px solid black;\">s <sub>1<\/sub> <sup>2<\/sup> \/n <sub>1<\/sub> + s <sub>2<\/sub> <sup>2<\/sup> \/n <sub>2<\/sub><\/span> )<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>\uc790\uc720\ub3c4:<\/strong><\/span> <span style=\"color: #000000;\">(s <sub>1<\/sub> <sup>2<\/sup> \/n <sub>1<\/sub> + s <sub>2<\/sub> <sup>2<\/sup> \/n <sub>2<\/sub> ) <sup>2<\/sup> \/ { [ (s <sub>1<\/sub> <sup>2<\/sup> \/ n <sub>1<\/sub> ) <sup>2<\/sup> \/ (n <sub>1<\/sub> \u2013 1) ] + [ (s <sub>2<\/sub> <sup>2<\/sup> \/ n <sub>2<\/sub> ) <sup>2<\/sup> \/ (n <sub>2<\/sub> \u2013 1) ] }<\/span><\/p>\n<p> <span style=\"color: #000000;\">Welch\uc758 t-\uac80\uc815\uc758 \uc790\uc720\ub3c4\ub97c \uacc4\uc0b0\ud558\ub294 \uacf5\uc2dd\uc740 \ub450 \ud45c\uc900 \ud3b8\ucc28 \uac04\uc758 \ucc28\uc774\ub97c \uace0\ub824\ud569\ub2c8\ub2e4. \ub450 <a href=\"https:\/\/statorials.org\/ko\/\u1106\u1169\u110c\u1175\u11b8\u1103\u1161\u11ab-\u1103\u1162-\u1111\u116d\u1107\u1169\u11ab\/\" target=\"_blank\" rel=\"noopener\">\ud45c\ubcf8\uc758<\/a> \ud45c\uc900 \ud3b8\ucc28\uac00 \ub3d9\uc77c\ud55c \uacbd\uc6b0 Welch\uc758 t-\uac80\uc815\uc758 \uc790\uc720\ub3c4\ub294 Student\uc758 t-\uac80\uc815\uc758 \uc790\uc720\ub3c4\uc640 \uc815\ud655\ud788 \ub3d9\uc77c\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc77c\ubc18\uc801\uc73c\ub85c \ub450 \ud45c\ubcf8\uc758 \ud45c\uc900 \ud3b8\ucc28\ub294 \ub3d9\uc77c\ud558\uc9c0 \uc54a\uc73c\ubbc0\ub85c Welch\uc758 t-\uac80\uc815\uc758 \uc790\uc720\ub3c4\ub294 Student\uc758 t-\uac80\uc815\uc758 \uc790\uc720\ub3c4\ubcf4\ub2e4 \uc791\uc740 \uacbd\ud5a5\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Welch\uc758 t-\uac80\uc815\uc758 \uc790\uc720\ub3c4\ub294 \uc77c\ubc18\uc801\uc73c\ub85c \uc815\uc218\uac00 \uc544\ub2c8\ub77c\ub294 \uc810\uc5d0 \uc720\uc758\ud558\ub294 \uac83\ub3c4 \uc911\uc694\ud569\ub2c8\ub2e4. \uc218\ub3d9\uc73c\ub85c \ud14c\uc2a4\ud2b8\ud558\ub294 \uacbd\uc6b0 \uac00\uc7a5 \ub0ae\uc740 \uc815\uc218\ub85c \ubc18\uc62c\ub9bc\ud558\ub294 \uac83\uc774 \uac00\uc7a5 \uc88b\uc2b5\ub2c8\ub2e4. <em>R<\/em> \uacfc \uac19\uc740 \ud1b5\uacc4 \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub97c \uc0ac\uc6a9\ud558\uba74 \uc18c\ud504\ud2b8\uc6e8\uc5b4\uc5d0\uc11c \uc790\uc720\ub3c4\uc758 \uc2ed\uc9c4\uc218 \uac12\uc744 \uc81c\uacf5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<h2> <strong><span style=\"color: #000000;\">Welch t-\uac80\uc815\uc740 \uc5b8\uc81c \uc0ac\uc6a9\ud574\uc57c \ud569\ub2c8\uae4c?<\/span><\/strong><\/h2>\n<p> <span style=\"color: #000000;\">\uc5b4\ub5a4 \uc0ac\ub78c\ub4e4\uc740 <a href=\"https:\/\/daniellakens.blogspot.com\/2015\/01\/always-use-welchs-t-test-instead-of.html\" target=\"_blank\" rel=\"noopener noreferrer\">Welch\uc758 t-\uac80\uc815\uc774 \ub450 \ub3c5\ub9bd \uadf8\ub8f9\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud558\uae30 \uc704\ud55c \uae30\ubcf8 \uc120\ud0dd\uc774\uc5b4\uc57c \ud55c\ub2e4\uace0 \uc8fc\uc7a5\ud569\ub2c8\ub2e4. \uc65c\ub0d0\ud558\uba74 Welch\uc758 t-\uac80\uc815\uc740<\/a> \uadf8\ub8f9 \uac04\uc5d0 \ud45c\ubcf8 \ud06c\uae30\uc640 \ubd84\uc0b0\uc774 \ub3d9\uc77c\ud558\uc9c0 \uc54a\uc744 \ub54c \uc2a4\ud29c\ub358\ud2b8 t-\uac80\uc815\ubcf4\ub2e4 \ub354 \ub098\uc740 \uc131\ub2a5\uc744 \ubc1c\ud718\ud558\uace0 \ud45c\ubcf8 \ud06c\uae30\uac00 \ub3d9\uc77c\ud560 \ub54c \ub3d9\uc77c\ud55c \uacb0\uacfc\ub97c \uc81c\uacf5\ud558\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \ub2e4\ub974\ub2e4. \ucc28\uc774\uc810\uc740 \ub3d9\uc77c\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc2e4\uc81c\ub85c \ub450 \uadf8\ub8f9\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud560 \ub54c \uac01 \uadf8\ub8f9\uc758 \ud45c\uc900 \ud3b8\ucc28\uac00 \ub3d9\uc77c\ud560 \uac00\ub2a5\uc131\uc740 \uac70\uc758 \uc5c6\uc2b5\ub2c8\ub2e4. \ub530\ub77c\uc11c \ud56d\uc0c1 Welch\uc758 t-\uac80\uc815\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc88b\uc2b5\ub2c8\ub2e4. \uadf8\ub7ec\uba74 \ub4f1\ubd84\uc0b0\uc5d0 \ub300\ud55c \uac00\uc815\uc744 \ud560 \ud544\uc694\uac00 \uc5c6\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Welch\uc758 t-\uac80\uc815 \uc0ac\uc6a9 \uc608<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c\uc73c\ub85c \ub2e4\uc74c \ub450 \ud45c\ubcf8\uc5d0 \ub300\ud574 Welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud558\uc5ec \ubaa8\uc9d1\ub2e8 \ud3c9\uade0\uc774 0.05 \uc720\uc758 \uc218\uc900\uc5d0\uc11c \ud06c\uac8c \ub2e4\ub978\uc9c0 \uc5ec\ubd80\ub97c \ud655\uc778\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>\uc0d8\ud50c 1:<\/strong> 14, 15, 15, 15, 16, 18, 22, 23, 24, 25, 25<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>\uc0d8\ud50c 2:<\/strong> 10, 12, 14, 15, 18, 22, 24, 27, 31, 33, 34, 34, 34<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc138 \uac00\uc9c0 \ubc29\ubc95\uc73c\ub85c \ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">\uc190\uc73c\ub85c<\/span><\/li>\n<li> <span style=\"color: #000000;\">\ub9c8\uc774\ud06c\ub85c\uc18c\ud504\ud2b8 \uc5d1\uc140\uc744 \uc0ac\uc6a9\ud558\uc138\uc694<\/span><\/li>\n<li> <span style=\"color: #000000;\"><em>R<\/em> \ud1b5\uacc4 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4 \uc0ac\uc6a9<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Welch\uc758 T \ud14c\uc2a4\ud2b8\ub97c \uc9c1\uc811 \uc218\ud589<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Welch t-\uac80\uc815\uc744 \uc9c1\uc811 \uc218\ud589\ud558\ub824\uba74 \uba3c\uc800 \ud45c\ubcf8 \ud3c9\uade0, \ud45c\ubcf8 \ubd84\uc0b0 \ubc0f \ud45c\ubcf8 \ud06c\uae30\ub97c \ucc3e\uc544\uc57c \ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong><span style=\"border-top: 1px solid black;\">x1<\/span> <sub>\u2013<\/sub><\/strong> 19.27<br \/><\/span> <span style=\"color: #000000;\"><strong><span style=\"border-top: 1px solid black;\">x2<\/span> <sub>\u2013<\/sub><\/strong> 23.69<br \/> <strong><sub>1\uc2dc<\/sub> <sup>2<\/sup> \ubd84<\/strong> \u2013 \uc624\ud6c4 8\uc2dc 42\ubd84<br \/><\/span> <span style=\"color: #000000;\"><strong>\uc608\uc220 <sub>2<\/sub> <sup>2<\/sup><\/strong> \u2013 83.23<br \/> <strong>#<\/strong> <sub><strong>1<\/strong><\/sub> \u2013 11 <strong><br \/>#<\/strong> <sub><strong>2<\/strong><\/sub> \u2013 13<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uadf8\ub7f0 \ub2e4\uc74c \ub2e4\uc74c \uc22b\uc790\ub97c \uc785\ub825\ud558\uc5ec \ud14c\uc2a4\ud2b8 \ud1b5\uacc4\ub97c \ucc3e\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>\uac80\uc815 \ud1b5\uacc4\ub7c9:<\/strong> ( <span style=\"border-top: 1px solid black;\">x <sub>1<\/sub><\/span> \u2013 <span style=\"border-top: 1px solid black;\">x <sub>2<\/sub><\/span> ) \/ (\u221a <span style=\"border-top: 1px solid black;\">s <sub>1<\/sub> <sup>2<\/sup> \/n <sub>1<\/sub> + s <sub>2<\/sub> <sup>2<\/sup> \/n <sub>2<\/sub><\/span> )<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uac80\uc815 \ud1b5\uacc4\ub7c9: (19.27 \u2013 23.69) \/ (\u221a <span style=\"border-top: 1px solid black;\">20.42\/11 + 83.23\/13<\/span> ) = -4.42 \/ 2.873 = <strong>-1.538<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>\uc790\uc720\ub3c4:<\/strong> (s <sub>1<\/sub> <sup>2<\/sup> \/n <sub>1<\/sub> + s <sub>2<\/sub> <sup>2<\/sup> \/n <sub>2<\/sub> ) <sup>2<\/sup> \/ { [ (s <sub>1<\/sub> <sup>2<\/sup> \/ n <sub>1<\/sub> ) <sup>2<\/sup> \/ (n <sub>1<\/sub> \u2013 1) ] + [ (s <sub>2<\/sub> <sup>2<\/sup> \/ n <sub>2<\/sub> ) <sup>2<\/sup> \/ (n <sub>2<\/sub> \u2013 1) ] }<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc790\uc720\ub3c4: (20.42\/11 + 83.23\/13) <sup>2<\/sup> \/ { [ (20.42\/11) <sup>2<\/sup> \/ (11 \u2013 1) ] + [ (83.23\/13) <sup>2<\/sup> \/ (13 \u2013 1) ] } = 18.137. \uc774 \uacb0\uacfc\ub97c \uac00\uc7a5 \uac00\uae4c\uc6b4 \uc815\uc218\uc778 <strong>18<\/strong> \ub85c \ubc18\uc62c\ub9bc\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub9c8\uc9c0\ub9c9\uc73c\ub85c 18 \uc790\uc720\ub3c4\uc5d0 \ub300\ud574 \uc54c\ud30c = 0.05\uc778 \uc591\uba74 \ud14c\uc2a4\ud2b8\uc5d0 \ud574\ub2f9\ud558\ub294 t \ubd84\ud3ec \ud14c\uc774\ube14\uc5d0\uc11c \uc784\uacc4\uac12 <em>t\ub97c<\/em> \ucc3e\uc2b5\ub2c8\ub2e4.<\/span> <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/t_dist.png\" alt=\"\ubc30\ud3ec \ud14c\uc774\ube14 T\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">\uc784\uacc4\uac12 t\ub294 <strong>2.101<\/strong> \uc785\ub2c8\ub2e4. \uac80\uc815 \ud1b5\uacc4\ub7c9(1.538)\uc758 \uc808\ub300\uac12\uc774 \uc784\uacc4\uac12 t\ubcf4\ub2e4 \ud06c\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0 \uac80\uc815\uc758 \uadc0\ubb34\uac00\uc124\uc744 \uae30\uac01\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ud3c9\uade0\uc774 \ud06c\uac8c \ub2e4\ub974\ub2e4\uace0 \ub9d0\ud560 \uc218 \uc788\ub294 \uc99d\uac70\uac00 \ucda9\ubd84\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Excel\uc744 \uc0ac\uc6a9\ud55c Welch\uc758 T-\uac80\uc815<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Excel\uc5d0\uc11c Welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub824\uba74 \uba3c\uc800 \ubb34\ub8cc Analysis ToolPak \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub97c \ub2e4\uc6b4\ub85c\ub4dc\ud574\uc57c \ud569\ub2c8\ub2e4. \uc544\uc9c1 Excel\ub85c \ub2e4\uc6b4\ub85c\ub4dc\ud558\uc9c0 \uc54a\uc73c\uc168\ub2e4\uba74 <a href=\"https:\/\/statorials.org\/ko\/excel\u110b\u1166\u1109\u1165-\u1107\u116e\u11ab\u1109\u1165\u11a8-\u1103\u1169\u1100\u116e-\u1111\u1162\u11a8\u110b\u1173\u11af-\u1105\u1169\u1103\u1173\u1112\u1161\u1102\u1173\u11ab-\u1107\u1161\u11bc\u1107\u1165\u11b8\/\" target=\"_blank\" rel=\"noopener noreferrer\">\ub2e4\uc6b4\ub85c\ub4dc \ubc29\ubc95\uc5d0 \ub300\ud55c \uac04\ub2e8\ud55c \ud29c\ud1a0\ub9ac\uc5bc\uc744<\/a> \uc791\uc131\ud574 \ub450\uc5c8\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Analysis ToolPak\uc744 \ub2e4\uc6b4\ub85c\ub4dc\ud55c \ud6c4\uc5d0\ub294 \uc544\ub798 \ub2e8\uacc4\uc5d0 \ub530\ub77c \ub450 \uc0d8\ud50c\uc5d0 \ub300\ud574 Welch\uc758 t-\ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>1. \ub370\uc774\ud130\ub97c \uc785\ub825\ud569\ub2c8\ub2e4.<\/strong> A\uc5f4\uacfc B\uc5f4\uc5d0 \ub450 \uc0d8\ud50c\uc5d0 \ub300\ud55c \ub370\uc774\ud130 \uac12\uc744 \uc785\ub825\ud558\uace0 \uac01 \uc5f4\uc758 \uccab \ubc88\uc9f8 \uc140\uc5d0 <em>Sample 1<\/em> \uacfc <em>Sample 2<\/em> \ub77c\ub294 \uc81c\ubaa9\uc744 \uc785\ub825\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>2. Analysis ToolPak\uc744 \uc0ac\uc6a9\ud558\uc5ec Welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud569\ub2c8\ub2e4.<\/strong> \uc0c1\ub2e8 \ub9ac\ubcf8\uc5d0 \uc788\ub294 <strong>\ub370\uc774\ud130<\/strong> \ud0ed\uc73c\ub85c \uc774\ub3d9\ud569\ub2c8\ub2e4. \uadf8\ub7f0 \ub2e4\uc74c <strong>\ubd84\uc11d<\/strong> \uadf8\ub8f9\uc5d0\uc11c \ubd84\uc11d \ub3c4\uad6c \uc544\uc774\ucf58\uc744 \ud074\ub9ad\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ud45c\uc2dc\ub418\ub294 \ub300\ud654 \uc0c1\uc790\uc5d0\uc11c <strong>t-\uac80\uc815: \ub450 \ud45c\ubcf8\uc774 \ub3d9\uc77c\ud558\uc9c0 \uc54a\uc740 \ubd84\uc0b0\uc744 \uac00\uc815<\/strong> \ud558\uace0 \ud655\uc778\uc744 \ud074\ub9ad\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub9c8\uc9c0\ub9c9\uc73c\ub85c \uc544\ub798 \uac12\uc744 \uc785\ub825\ud55c \ud6c4 \ud655\uc778\uc744 \ud074\ub9ad\ud558\uc138\uc694.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c \uacb0\uacfc\uac00 \ub098\ud0c0\ub098\uc57c \ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc774 \ud14c\uc2a4\ud2b8\uc758 \uacb0\uacfc\ub294 \uc218\ub3d9\uc73c\ub85c \uc5bb\uc740 \uacb0\uacfc\uc640 \uc77c\uce58\ud569\ub2c8\ub2e4.<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">\uac80\uc815 \ud1b5\uacc4\ub7c9\uc740 <strong>-1.5379<\/strong> \uc785\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\uc591\uce21 \uc784\uacc4\uac12\uc740 <strong>2.1009<\/strong> \uc785\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\uac80\uc815 \ud1b5\uacc4\ub7c9\uc758 \uc808\ub300\uac12\uc774 \uc591\uce21 \uc784\uacc4\uac12\ubcf4\ub2e4 \ud06c\uc9c0 \uc54a\uc73c\ubbc0\ub85c \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ud3c9\uade0\uc740 \ud1b5\uacc4\uc801\uc73c\ub85c \ub2e4\ub974\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\ub610\ud55c \uac80\uc815\uc758 \uc591\uce21 p-\uac12\uc740 0.14\ub85c 0.05\ubcf4\ub2e4 \ud06c\uace0 \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ud3c9\uade0\uc774 \ud1b5\uacc4\uc801\uc73c\ub85c \ub2e4\ub974\uc9c0 \uc54a\uc74c\uc744 \ud655\uc778\ud569\ub2c8\ub2e4.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>R\uc744 \uc0ac\uc6a9\ud55c Welch\uc758 t-\uac80\uc815<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c \ucf54\ub4dc\ub294 <em>R<\/em> \ud1b5\uacc4 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub450 \uc0d8\ud50c\uc5d0 \ub300\ud574 Welch\uc758 t-\ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create two vectors to hold sample data values\n<\/span>sample1 &lt;- c(14, 15, 15, 15, 16, 18, 22, 23, 24, 25, 25)\nsample2 &lt;- c(10, 12, 14, 15, 18, 22, 24, 27, 31, 33, 34, 34, 34)\n\n<span style=\"color: #008080;\">#conduct Welch's test\n<\/span><span style=\"color: #800080;\">t.test(<\/span> sample1, sample2)\n\n# Welch Two Sample t-test\n#\n#data: sample1 and sample2\n#t = -1.5379, df = 18.137, p-value = 0.1413\n#alternative hypothesis: true difference in means is not equal to 0\n#95 percent confidence interval:\n#-10.453875 1.614714\n#sample estimates:\n#mean of x mean of y \n#19.27273 23.69231 \n#<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>t.test()<\/strong> \ud568\uc218\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uad00\ub828 \ucd9c\ub825\uc744 \ud45c\uc2dc\ud569\ub2c8\ub2e4.<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>t:<\/strong> \uac80\uc815 \ud1b5\uacc4\ub7c9 = <strong>-1.5379<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>df<\/strong> : \uc790\uc720\ub3c4 = <strong>18.137<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>p-\uac12:<\/strong> \uc591\uce21 \uac80\uc815\uc758 p-\uac12 = <strong>0.1413<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>95% \uc2e0\ub8b0\uad6c\uac04<\/strong> : \ubaa8\uc9d1\ub2e8 \ud3c9\uade0\uc758 \uc2e4\uc81c \ucc28\uc774\uc5d0 \ub300\ud55c 95% \uc2e0\ub8b0\uad6c\uac04 = <strong>(-10.45, 1.61)<\/strong><\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">\uc774 \ud14c\uc2a4\ud2b8\uc758 \uacb0\uacfc\ub294 Excel\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc218\ub3d9\uc73c\ub85c \uc5bb\uc740 \uacb0\uacfc\uc640 \uc77c\uce58\ud569\ub2c8\ub2e4. \uc774 \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ud3c9\uade0 \ucc28\uc774\ub294 \uc54c\ud30c = 0.05 \uc218\uc900\uc5d0\uc11c \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ub450 \uac1c\uc758 \ub3c5\ub9bd\uc801\uc778 \uadf8\ub8f9\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud558\ub824\ub294 \uacbd\uc6b0 \ub450 \uac00\uc9c0 \ub2e4\ub978 \ud14c\uc2a4\ud2b8 \uc0ac\uc6a9 \uc911\uc5d0\uc11c \uc120\ud0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc2a4\ud29c\ub358\ud2b8 t-\uac80\uc815: \uc774 \uac80\uc815\uc740 \ub450 \ub370\uc774\ud130 \uadf8\ub8f9\uc774 \uc815\uaddc \ubd84\ud3ec\ub97c \ub530\ub974\ub294 \ubaa8\uc9d1\ub2e8\uc5d0\uc11c \uc0d8\ud50c\ub9c1\ub418\uace0 \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c\ud558\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4. Welch\uc758 t-\uac80\uc815: \uc774 \uac80\uc815\uc5d0\uc11c\ub294 \ub450 \ub370\uc774\ud130 \uadf8\ub8f9\uc774 \ubaa8\ub450 \uc815\uaddc \ubd84\ud3ec\ub97c \ub530\ub974\ub294 \ubaa8\uc9d1\ub2e8\uc5d0\uc11c \uc0d8\ud50c\ub9c1\ub418\uc5c8\ub2e4\uace0 \uac00\uc815 \ud558\uc9c0\ub9cc \uc774 \ub450 \ubaa8\uc9d1\ub2e8\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c\ud558\ub2e4\uace0 \uac00\uc815\ud558\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-525","post","type-post","status-publish","format-standard","hentry","category-20"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Welch\uc758 t-\uac80\uc815: \uc0ac\uc6a9 \uc2dc\uae30 + \uc608 - \ud1b5\uacc4<\/title>\n<meta name=\"description\" content=\"Welch\uc758 t-\uac80\uc815 \uc0ac\uc6a9 \ubc29\ubc95\uacfc \uc0ac\uc6a9 \uc2dc\uae30\ub97c \uc5ec\ub7ec \uc608\uc640 \ud568\uaed8 \uc124\uba85\ud558\ub294 \uac04\ub2e8\ud55c \uc548\ub0b4\uc11c\uc785\ub2c8\ub2e4.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/ko\/\u110b\u1170\u11af\u110e\u1175\u1109\u1173-t-\u1110\u1166\u1109\u1173\u1110\u1173\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Welch\uc758 t-\uac80\uc815: \uc0ac\uc6a9 \uc2dc\uae30 + \uc608 - 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