{"id":511,"date":"2023-07-29T16:03:36","date_gmt":"2023-07-29T16:03:36","guid":{"rendered":"https:\/\/statorials.org\/ko\/%e1%84%8a%e1%85%a1%e1%86%bc%e1%84%8b%e1%85%b3%e1%86%af-%e1%84%8b%e1%85%b5%e1%84%85%e1%85%ae%e1%84%82%e1%85%b3%e1%86%ab-%e1%84%91%e1%85%ad%e1%84%87%e1%85%a9%e1%86%ab-t-%e1%84%80%e1%85%a5%e1%86%b7-2\/"},"modified":"2023-07-29T16:03:36","modified_gmt":"2023-07-29T16:03:36","slug":"%e1%84%8a%e1%85%a1%e1%86%bc%e1%84%8b%e1%85%b3%e1%86%af-%e1%84%8b%e1%85%b5%e1%84%85%e1%85%ae%e1%84%82%e1%85%b3%e1%86%ab-%e1%84%91%e1%85%ad%e1%84%87%e1%85%a9%e1%86%ab-t-%e1%84%80%e1%85%a5%e1%86%b7-2","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/%e1%84%8a%e1%85%a1%e1%86%bc%e1%84%8b%e1%85%b3%e1%86%af-%e1%84%8b%e1%85%b5%e1%84%85%e1%85%ae%e1%84%82%e1%85%b3%e1%86%ab-%e1%84%91%e1%85%ad%e1%84%87%e1%85%a9%e1%86%ab-t-%e1%84%80%e1%85%a5%e1%86%b7-2\/","title":{"rendered":"R\uc5d0\uc11c \uc30d\uc744 \uc774\ub8e8\ub294 \uc0d8\ud50c t-\ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><a href=\"https:\/\/statorials.org\/ko\/\u110a\u1161\u11bc\u110b\u1173\u11af-\u110b\u1175\u1105\u116e\u1102\u1173\u11ab-\u1111\u116d\u1107\u1169\u11ab-t-\u1100\u1165\u11b7\u110c\u1165\u11bc\/\" target=\"_blank\" rel=\"noopener\">\ub300\uc751 \ud45c\ubcf8 t-\uac80\uc815\uc740<\/a> \ud55c \ud45c\ubcf8\uc758 \uac01 \uad00\uce21\uce58\uac00 \ub2e4\ub978 \ud45c\ubcf8\uc758 <a href=\"https:\/\/statorials.org\/ko\/\u1110\u1169\u11bc\u1100\u1168\u110b\u1166\u1109\u1165\u110b\u1174-\u1100\u116a\u11ab\u110e\u1161\u11af\/\" target=\"_blank\" rel=\"noopener\">\uad00\uce21\uce58<\/a> \uc640 \uc77c\uce58\ud560 \uc218 \uc788\uc744 \ub54c \ub450 \ud45c\ubcf8\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud558\ub294 \ud1b5\uacc4 \uac80\uc815\uc785\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc608\ub97c \ub4e4\uc5b4, \ud2b9\uc815 \ucee4\ub9ac\ud058\ub7fc\uc774 \ud559\uc0dd\ub4e4\uc758 \ud2b9\uc815 \uc2dc\ud5d8 \uc131\uc801\uc5d0 \uc911\uc694\ud55c \uc601\ud5a5\uc744 \ubbf8\uce58\ub294\uc9c0 \uc54c\uace0 \uc2f6\ub2e4\uace0 \uac00\uc815\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774\ub97c \ud14c\uc2a4\ud2b8\ud558\uae30 \uc704\ud574 \uc6b0\ub9ac\ub294 \ud55c \ud559\uae09\uc758 20\uba85\uc758 \ud559\uc0dd\uc5d0\uac8c \uc0ac\uc804 \ud14c\uc2a4\ud2b8\ub97c \uc694\uccad\ud569\ub2c8\ub2e4. \uadf8\ub7f0 \ub2e4\uc74c \uac01 \ud559\uc0dd\ub4e4\uc740 2\uc8fc \ub3d9\uc548 \ub9e4\uc77c \ud559\uc2b5 \ud504\ub85c\uadf8\ub7a8\uc5d0 \ucc38\uc5ec\ud569\ub2c8\ub2e4. \uadf8\ub7f0 \ub2e4\uc74c \ud559\uc0dd\ub4e4\uc740 \ube44\uc2b7\ud55c \ub09c\uc774\ub3c4\uc758 \uc2dc\ud5d8\uc744 \ub2e4\uc2dc \uce58\ub985\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uccab \ubc88\uc9f8 \uc2dc\ud5d8\uacfc \ub450 \ubc88\uc9f8 \uc2dc\ud5d8\uc758 \ud3c9\uade0 \uc810\uc218 \ucc28\uc774\ub97c \ube44\uad50\ud558\uae30 \uc704\ud574 \uac01 \ud559\uc0dd\uc5d0 \ub300\ud574 \uccab \ubc88\uc9f8 \uc2dc\ud5d8 \uc810\uc218\uac00 \ub450 \ubc88\uc9f8 \uc2dc\ud5d8 \uc810\uc218\uc640 \uc5f0\uad00\ub420 \uc218 \uc788\uae30 \ub54c\ubb38\uc5d0 \ub300\uc751 t-\uac80\uc815\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>\ub300\uc751 t \uac80\uc815\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">\ub300\uc751 t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub824\uba74 \ub2e4\uc74c \uc811\uadfc \ubc29\uc2dd\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <strong><span style=\"color: #000000;\">1\ub2e8\uacc4: \uadc0\ubb34\uac00\uc124\uacfc \ub300\ub9bd\uac00\uc124\uc744 \uc9c4\uc220\ud569\ub2c8\ub2e4.<\/span><\/strong><\/p>\n<p> <span style=\"color: #000000;\"><strong>H <sub>0<\/sub> : \u03bc <sub>d<\/sub> = 0<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>H <sub>a<\/sub> : \u03bc <sub>d<\/sub> \u2260 0<\/strong> (\uc591\uba74)<\/span><br \/> <span style=\"color: #000000;\"><strong>H <sub>a<\/sub> : \u03bc <sub>d<\/sub> &gt; 0<\/strong> (\ub2e8\uce21)<\/span><br \/> <span style=\"color: #000000;\"><strong>H <sub>a<\/sub> : \u03bc <sub>d<\/sub> &lt; 0<\/strong> (\ub2e8\uba74)<\/span><\/p>\n<p> <span style=\"color: #000000;\"><em>\uc5ec\uae30\uc11c <strong>\u03bcd <sub>\ub294<\/sub><\/strong> \ud3c9\uade0 \ucc28\uc774\uc785\ub2c8\ub2e4.<\/em><\/span><\/p>\n<p> <strong><span style=\"color: #000000;\">2\ub2e8\uacc4: \uac80\uc815 \ud1b5\uacc4\ub7c9\uacfc \ud574\ub2f9 p-\uac12\uc744 \ucc3e\uc2b5\ub2c8\ub2e4.<\/span><\/strong><\/p>\n<p> <span style=\"color: #000000;\"><em>a<\/em> = \ud559\uc0dd\uc758 \uccab \ubc88\uc9f8 \uc2dc\ud5d8 \uc810\uc218, <em>b<\/em> = \ud559\uc0dd\uc758 \ub450 \ubc88\uc9f8 \uc2dc\ud5d8 \uc810\uc218\ub85c \uc124\uc815\ud569\ub2c8\ub2e4. \uc2dc\ud5d8 \uc810\uc218 \uac04\uc758 \uc2e4\uc81c \ud3c9\uade0 \ucc28\uc774\uac00 0\uc774\ub77c\ub294 \uadc0\ubb34 \uac00\uc124\uc744 \uac80\uc815\ud558\ub824\uba74 \ub2e4\uc74c\uc744 \uc218\ud589\ud558\uc2ed\uc2dc\uc624.<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">\uac01 \uc810\uc218 \uc30d \uac04\uc758 \ucc28\uc774\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4(d <sub>i<\/sub> = b <sub>i<\/sub> \u2013 a <sub>i<\/sub> ).<\/span><\/li>\n<li> <span style=\"color: #000000;\">\ud3c9\uade0 \ucc28\uc774(d)\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\ucc28\uc774\uc758 \ud45c\uc900\ud3b8\ucc28\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4. s <sub>d<\/sub><\/span><\/li>\n<li> <span style=\"color: #000000;\">T = d \/ (s <sub>d<\/sub> \/ \u221an)\uc778 t \ud1b5\uacc4\ub7c9\uc744 \uacc4\uc0b0\ud569\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\uc790\uc720\ub3c4\uac00 <em>n-1<\/em> \uc778 t-\ud1b5\uacc4\ub7c9\uc5d0 \ud574\ub2f9\ud558\ub294 p-\uac12\uc744 \ucc3e\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\"><strong>3\ub2e8\uacc4: \uc720\uc758 \uc218\uc900\uc5d0 \ub530\ub77c \uadc0\ubb34 \uac00\uc124\uc744 \uae30\uac01\ud558\uac70\ub098 \uae30\uac01\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">p-\uac12\uc774 \uc120\ud0dd\ud55c \uc720\uc758 \uc218\uc900\ubcf4\ub2e4 \uc791\uc73c\uba74 \uadc0\ubb34 \uac00\uc124\uc744 \uae30\uac01\ud558\uace0 \ub450 \uadf8\ub8f9\uc758 \ud3c9\uade0 \uac04\uc5d0 \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ud55c \ucc28\uc774\uac00 \uc788\ub2e4\ub294 \uacb0\ub860\uc744 \ub0b4\ub9bd\ub2c8\ub2e4. \uadf8\ub807\uc9c0 \uc54a\uc73c\uba74 \uadc0\ubb34\uac00\uc124\uc744 \uae30\uac01\ud558\uc9c0 \ubabb\ud560 \uac83\uc785\ub2c8\ub2e4.<\/span><\/p>\n<h2> <strong><span style=\"color: #000000;\">R\uc5d0\uc11c \uc30d t \ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/span><\/strong><\/h2>\n<p> <span style=\"color: #000000;\">R\uc5d0\uc11c \uc30d t \ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub824\uba74 \ub2e4\uc74c \uad6c\ubb38\uacfc \ud568\uaed8 \ub0b4\uc7a5 \ud568\uc218 <strong>t.test()\ub97c<\/strong> \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>t.test<\/strong> (x, y, paired = TRUE, \ub300\uccb4 = &#8220;\uc591\uce21&#8221;)<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>x,y:<\/strong> \ube44\uad50\ud558\ub824\ub294 \ub450 \ub514\uc9c0\ud138 \ubca1\ud130<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>paired:<\/strong> paired t-test\ub97c \uacc4\uc0b0\ud558\ub824\uace0 \ud568\uc744 \uc9c0\uc815\ud558\ub294 \ub17c\ub9ac\uac12<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>\ub300\uc548:<\/strong> \ub300\uc548 \uac00\uc124. \uc774\ub294 &#8220;\uc591\uba74&#8221;(\uae30\ubcf8\uac12), &#8220;\uc0c1\ub2e8&#8221; \ub610\ub294 &#8220;\ud558\ub2e8&#8221;\uc73c\ub85c \uc124\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c \uc608\uc5d0\uc11c\ub294 20\uba85\uc758 \ud559\uc0dd\uc744 \ub300\uc0c1\uc73c\ub85c \uc0ac\uc804 \ud14c\uc2a4\ud2b8\uc640 \uc0ac\ud6c4 \ud14c\uc2a4\ud2b8 \uac04\uc758 \ud3c9\uade0 \uc810\uc218\uc5d0 \uc720\uc758\ubbf8\ud55c \ucc28\uc774\uac00 \uc788\ub294\uc9c0 \ud655\uc778\ud558\uae30 \uc704\ud574 \ub300\uc751 t-\ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>\ub370\uc774\ud130 \uc0dd\uc131<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">\uba3c\uc800 \ub370\uc774\ud130 \uc138\ud2b8\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create the dataset<\/span>\ndata &lt;- data.frame(score = c(85,85, 78, 78, 92, 94, 91, 85, 72, 97,\n                             84, 95, 99, 80, 90, 88, 95, 90, 96, 89,\n                             84, 88, 88, 90, 92, 93, 91, 85, 80, 93,\n                             97, 100, 93, 91, 90, 87, 94, 83, 92, 95),\n                   group = c(rep('pre', 20), rep('post', 20)))\n\n<span style=\"color: #008080;\">#view the dataset\n<\/span>data\n\n#scoregroup\n#1 85 pre\n#2 85 pre\n#3 78 pre\n#4 78 pre\n#5 92 pre\n#6 94 pre\n#7 91 pre\n#8 85 pre\n#9 72 pre\n#10 97 pre\n#11 84 pre\n#12 95 pre\n#13 99 pre\n#14 80 pre\n#15 90 pre\n#16 88 pre\n#17 95 pre\n#18 90 pre\n#19 96 pre\n#20 89 pre\n#21 84 post\n#22 88 post\n#23 88 post\n#24 90 post\n#25 92 post\n#26 93 post\n#27 91 post\n#28 85 post\n#29 80 post\n#30 93 post\n#31 97 post\n#32 100 posts\n#33 93 post\n#34 91 post\n#35 90 post\n#36 87 post\n#37 94 post\n#38 83 post\n#39 92 post\n#40 95 post\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>\ucc28\uc774\uc810\uc744 \uc2dc\uac01\ud654\ud558\uc138\uc694<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c\uc73c\ub85c <a href=\"https:\/\/statorials.org\/ko\/\u1110\u1169\u11bc\u1100\u1168\u1112\u1161\u11a8\u110b\u1173\u11ab-\u1100\u1161\u11ab\u1103\u1161\u11ab\u1112\u1161\u1100\u1169-\u110c\u1175\u11a8\u110c\u1165\u11b8\u110c\u1165\u11a8\u110b\u1175\u11ab-\u1107\u1161\u11bc\u1107\u1165\u11b8\u110b\u1173\u1105\u1169-\u1100\u1162\u1102\u1167\u11b7\u110b\u1173\u11af-\u1109\u1165\u11af\u1106\u1167\u11bc\u1112\u1161\u1106\u1173\u1105\u1169-\u1110\u1169\u11bc\u1100\u1168\u1105\u1173\u11af-\u1103\u1165-\u1109\u1171\u11b8\u1100\u1166-\u1107\u1162\u110b\u116e\u11af-\u1109\u116e-\u110b\u1175\u11bb\u1109\u1173\u11b8\u1102\u1175\u1103\u1161.\/\" target=\"_blank\" rel=\"noopener\"><strong>dplyr<\/strong><\/a> \ub77c\uc774\ube0c\ub7ec\ub9ac\uc758 <strong>group_by()<\/strong> \ubc0f <strong>summary<\/strong> <strong>()<\/strong> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub450 \uadf8\ub8f9\uc758 \uc694\uc57d \ud1b5\uacc4\ub97c \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#load <em>dplyr<\/em> library\n<span style=\"color: #000000;\">library(dplyr)<\/span>\n\n#find sample size, mean, and standard deviation for each group\n<span style=\"color: #000000;\">data %&gt;%\n<span style=\"color: #800080;\">group_by<\/span> (group) %&gt;%\n  <span style=\"color: #800080;\">summarize<\/span> (\n    count = n(),\n    mean = mean(score),\n    sd = sd(score)\n  )\n<\/span><\/span>\n# A tibble: 2 x 4\n# group count mean sd\n#     \n#1 post 20 90.3 4.88\n#2 pre 20 88.2 7.24<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\ub610\ud55c R\uc758 <strong>boxplot()<\/strong> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec <a href=\"https:\/\/statorials.org\/ko\/\u1110\u1169\u11bc\u1100\u1168\u1112\u1161\u11a8\u110b\u1173\u11ab-\u1100\u1161\u11ab\u1103\u1161\u11ab\u1112\u1161\u1100\u1169-\u110c\u1175\u11a8\u110c\u1165\u11b8\u110c\u1165\u11a8\u110b\u1175\u11ab-\u1107\u1161\u11bc\u1107\u1165\u11b8\u110b\u1173\u1105\u1169-\u1100\u1162\u1102\u1167\u11b7\u110b\u1173\u11af-\u1109\u1165\u11af\u1106\u1167\u11bc\u1112\u1161\u1106\u1173\u1105\u1169-\u1110\u1169\u11bc\u1100\u1168\u1105\u1173\u11af-\u1103\u1165-\u1109\u1171\u11b8\u1100\u1166-\u1107\u1162\u110b\u116e\u11af-\u1109\u116e-\u110b\u1175\u11bb\u1109\u1173\u11b8\u1102\u1175\u1103\u1161.\/\" target=\"_blank\" rel=\"noopener\">\uc0c1\uc790 \uadf8\ub9bc\uc744<\/a> \ub9cc\ub4e4\uc5b4 \uc0ac\uc804 \ubc0f \uc0ac\ud6c4 \uadf8\ub8f9\uc5d0 \ub300\ud55c \uc810\uc218 \ubd84\ud3ec\ub97c \ud45c\uc2dc\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #800080;\">boxplot<\/span> (score~group,\n  data=data,\n  main=\"Test Scores by Group\",\n  xlab=\"Group\",\n  ylab=\"Score\",\n  col=\"steelblue\",\n  border=\"black\"\n)<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\uc694\uc57d \ud1b5\uacc4\uc640 \ubc15\uc2a4 \ud50c\ub86f\uc744 \ud1b5\ud574 <em>\ud3ec\uc2a4\ud2b8<\/em> \uadf8\ub8f9\uc758 \ud3c9\uade0 \uc810\uc218\uac00 <em>\ud504\ub9ac<\/em> \uadf8\ub8f9\uc758 \ud3c9\uade0 \uc810\uc218\ubcf4\ub2e4 \uc57d\uac04 \ub192\uc740 \uac83\uc744 \ud655\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub610\ud55c <em>\uc0ac\ud6c4<\/em> \uadf8\ub8f9 \uc810\uc218\uac00 <em>\uc0ac\uc804<\/em> \uadf8\ub8f9 \uc810\uc218\ubcf4\ub2e4 \ubcc0\ub3d9\uc131\uc774 \uc801\ub2e4\ub294 \uac83\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc774 \ub450 \uadf8\ub8f9\uc758 \ud3c9\uade0 \ucc28\uc774\uac00 \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ud55c\uc9c0 \ud655\uc778\ud558\uae30 \uc704\ud574 \ub300\uc751 t \uac80\uc815\uc744 \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<h3> <strong><span style=\"color: #000000;\">\uc30d\uccb4 t-\uac80\uc815 \uc218\ud589<\/span><\/strong><\/h3>\n<p> <span style=\"color: #000000;\">\ub300\uc751 t \uac80\uc815\uc744 \uc218\ud589\ud558\uae30 \uc804\uc5d0 \ucc28\uc774 \ubd84\ud3ec\uac00 \uc815\uaddc \ubd84\ud3ec(\ub610\ub294 \ub300\ub7b5 \uc815\uaddc \ubd84\ud3ec)\uc778\uc9c0 \ud655\uc778\ud574\uc57c \ud569\ub2c8\ub2e4. \uc774\ub97c \uc704\ud574 \uc0ac\uc804 \uc810\uc218\uc640 \uc0ac\ud6c4 \uc810\uc218\uc758 \ucc28\uc774\ub85c \uc815\uc758\ub41c \uc0c8 \ubca1\ud130\ub97c \ub9cc\ub4e4\uace0 \uc774 \uac12 \ubca1\ud130\uc758 \uc815\uaddc\uc131\uc5d0 \ub300\ud55c Shapiro-Wilk \ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define new vector for difference between post and pre scores\n<\/span>differences &lt;- with(data, score[group == \"post\"] - score[group == \"pre\"])\n\n<span style=\"color: #008080;\">#perform shapiro-wilk test for normality on this vector of values\n<\/span>shapiro.test(differences)\n\n# Shapiro-Wilk normality test\n#\n#data: differences\n#W = 0.92307, p-value = 0.1135\n#<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\uac80\uc815\uc758 p-\uac12\uc740 0.1135\ub85c \uc54c\ud30c = 0.05\ubcf4\ub2e4 \ud07d\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc6b0\ub9ac\ub294 \ub370\uc774\ud130\uac00 \uc815\uaddc \ubd84\ud3ec\ub97c \ub530\ub978\ub2e4\ub294 \uadc0\ubb34\uac00\uc124\uc744 \uae30\uac01\ud558\uc9c0 \ubabb\ud569\ub2c8\ub2e4. \uc774\ub294 \uc774\uc81c paired t-test\ub97c \uc9c4\ud589\ud560 \uc218 \uc788\uc74c\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c \ucf54\ub4dc\ub97c \uc0ac\uc6a9\ud558\uc5ec paired t-test\ub97c \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\">t.test<\/span> (score~group, data = data, paired = TRUE)\n\n# Paired t-test\n#\n#data: score by group\n#t = 1.588, df = 19, p-value = 0.1288\n#alternative hypothesis: true difference in means is not equal to 0\n#95 percent confidence interval:\n# -0.6837307 4.9837307\n#sample estimates:\n#mean of the differences \n#2.15 \n<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">\uacb0\uacfc\uc5d0\uc11c \uc6b0\ub9ac\ub294 \ub2e4\uc74c\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>t-<\/strong> \uac80\uc815 \ud1b5\uacc4\ub7c9\uc740 <strong>1.588<\/strong> \uc785\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\uc790\uc720\ub3c4(df)\uac00 19\uc778 \uc774 \uac80\uc815 \ud1b5\uacc4\ub7c9\uc758 p-\uac12\uc740 <strong>0.1288<\/strong> \uc785\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\ud3c9\uade0 \ucc28\uc774\uc5d0 \ub300\ud55c 95% \uc2e0\ub8b0 \uad6c\uac04\uc740 <strong>(-0.6837, 4.9837)<\/strong> \uc785\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">\ud504\ub9ac\uadf8\ub8f9\uacfc \ud3ec\uc2a4\ud2b8\uadf8\ub8f9\uc758 \uc810\uc218 \ucc28\uc774\ub294 \ud3c9\uade0 <strong>2.15<\/strong> \uc774\ub2e4.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">\ub530\ub77c\uc11c p-\uac12\uc774 \uc720\uc758 \uc218\uc900\uc778 0.05\ubcf4\ub2e4 \ub0ae\uae30 \ub54c\ubb38\uc5d0 \ub450 \uadf8\ub8f9\uc774 \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ud55c \ud3c9\uade0\uc744 \uac00\uc9c0\uace0 \uc788\ub2e4\ub294 \uadc0\ubb34 \uac00\uc124\uc744 \uae30\uac01\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc989, \uc0ac\uc804 \uadf8\ub8f9\uacfc \uc0ac\ud6c4 \uadf8\ub8f9 \uac04\uc758 \ud3c9\uade0 \uc810\uc218\uac00 \ud1b5\uacc4\uc801\uc73c\ub85c \ub2e4\ub974\ub2e4\uace0 \ub9d0\ud560 \uc218 \uc788\ub294 \ucda9\ubd84\ud55c \uc99d\uac70\uac00 \uc5c6\uc2b5\ub2c8\ub2e4. \uc774\ub294 \ucee4\ub9ac\ud058\ub7fc\uc774 \uc2dc\ud5d8 \uc810\uc218\uc5d0 \ud070 \uc601\ud5a5\uc744 \ubbf8\uce58\uc9c0 \uc54a\ub294\ub2e4\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub610\ud55c 95% \uc2e0\ub8b0 \uad6c\uac04\uc740 \ub450 \uadf8\ub8f9 \uac04\uc758 \uc2e4\uc81c \ud3c9\uade0 \ucc28\uc774\uac00 <strong>-0.6837<\/strong> \uacfc <strong>4.9837<\/strong> \uc0ac\uc774\uc5d0 \uc788\ub2e4\ub294 \uac83\uc744 &#8220;95% \ud655\uc2e0&#8221;\ud55c\ub2e4\ub294 \uac83\uc744 \ub098\ud0c0\ub0c5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc774 \uc2e0\ub8b0 \uad6c\uac04 \ub0b4\uc5d0 \uac12 <em>0\uc774<\/em> \ud3ec\ud568\ub418\uc5b4 \uc788\uc73c\ubbc0\ub85c \uc774\ub294 \uc2e4\uc81c\ub85c <em>0\uc774<\/em> \ud3c9\uade0 \uc810\uc218 \uac04\uc758 \uc2e4\uc81c \ucc28\uc774\uc77c \uc218 \uc788\uc74c\uc744 \uc758\ubbf8\ud558\uba70, \uc774\uac83\uc774 \ubc14\ub85c \uc774 \uacbd\uc6b0 \uadc0\ubb34 \uac00\uc124\uc744 \uae30\uac01\ud558\uc9c0 \ubabb\ud55c \uc774\uc720\uc785\ub2c8\ub2e4.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ub300\uc751 \ud45c\ubcf8 t-\uac80\uc815\uc740 \ud55c \ud45c\ubcf8\uc758 \uac01 \uad00\uce21\uce58\uac00 \ub2e4\ub978 \ud45c\ubcf8\uc758 \uad00\uce21\uce58 \uc640 \uc77c\uce58\ud560 \uc218 \uc788\uc744 \ub54c \ub450 \ud45c\ubcf8\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud558\ub294 \ud1b5\uacc4 \uac80\uc815\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \ud2b9\uc815 \ucee4\ub9ac\ud058\ub7fc\uc774 \ud559\uc0dd\ub4e4\uc758 \ud2b9\uc815 \uc2dc\ud5d8 \uc131\uc801\uc5d0 \uc911\uc694\ud55c \uc601\ud5a5\uc744 \ubbf8\uce58\ub294\uc9c0 \uc54c\uace0 \uc2f6\ub2e4\uace0 \uac00\uc815\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774\ub97c \ud14c\uc2a4\ud2b8\ud558\uae30 \uc704\ud574 \uc6b0\ub9ac\ub294 \ud55c \ud559\uae09\uc758 20\uba85\uc758 \ud559\uc0dd\uc5d0\uac8c \uc0ac\uc804 \ud14c\uc2a4\ud2b8\ub97c \uc694\uccad\ud569\ub2c8\ub2e4. \uadf8\ub7f0 \ub2e4\uc74c \uac01 \ud559\uc0dd\ub4e4\uc740 2\uc8fc \ub3d9\uc548 \ub9e4\uc77c \ud559\uc2b5 [&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-511","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>R\uc5d0\uc11c \uc30d\uc744 \uc774\ub8e8\ub294 \ud45c\ubcf8 t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95 - Statorials<\/title>\n<meta name=\"description\" content=\"\ub2e8\uacc4\ubcc4 \uc608\uc81c\ub97c \ud3ec\ud568\ud558\uc5ec R\uc5d0\uc11c \uc30d\uc744 \uc774\ub8e8\ub294 \uc0d8\ud50c t-\ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud55c \uac04\ub2e8\ud55c \uc124\uba85\uc785\ub2c8\ub2e4.\" 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