{"id":33390,"date":"2025-06-24T15:42:32","date_gmt":"2025-06-24T06:42:32","guid":{"rendered":"https:\/\/uxdaystokyo.com\/articles\/?post_type=glossary&#038;p=33390"},"modified":"2025-06-24T15:42:32","modified_gmt":"2025-06-24T06:42:32","slug":"conjunction-fallacy","status":"publish","type":"glossary","link":"https:\/\/uxdaystokyo.com\/articles\/glossary\/conjunction-fallacy\/","title":{"rendered":"\u9023\u8a00\u932f\u8aa4"},"content":{"rendered":"<p data-start=\"55\" data-end=\"232\">\u300cA\u304b\u3064B\u300d\u3088\u308a\u3082\u300cA\u5358\u72ec\u300d\u307e\u305f\u306f\u300cB\u5358\u72ec\u300d\u306e\u65b9\u304c\u3001\u767a\u751f\u78ba\u7387\u306f\u9ad8\u3044\uff08\u307e\u305f\u306f\u540c\u7b49\uff09\u3067\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u7269\u8a9e\u7684\u30fb\u76f4\u611f\u7684\u306a\u8aac\u660e\u300c\u3082\u3063\u3068\u3082\u3089\u3057\u3055\u300d\u300c\u307d\u3055\u300d\u306b\u3088\u308b\u8a8d\u77e5\u30d0\u30a4\u30a2\u30b9\u3002<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<th><\/th>\n<th>A\u306e\u78ba\u7387<\/th>\n<th>B\u306e\u78ba\u7387<\/th>\n<th>A\u3068B\u306e\u78ba\u7387\uff08\u9023\u8a00\uff09<\/th>\n<\/tr>\n<tr>\n<td>\u8ad6\u7406\u7684\u306a\u7d50\u679c<\/td>\n<td>0.6<\/td>\n<td>0.3<\/td>\n<td>0.18<\/td>\n<\/tr>\n<tr>\n<td>\u9023\u8a00\u932f\u8aa4\u306e\u7d50\u679c<\/td>\n<td>0.6<\/td>\n<td>0.3<\/td>\n<td><strong>0.4<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>\u8868\u304b\u3089\u3082\u308f\u304b\u308b\u901a\u308a\u3001A\u3068B\u306e\u4e21\u65b9\u304c\u8d77\u3053\u308b\u78ba\u7387\u306f\u3001\u305d\u308c\u305e\u308c\u5358\u72ec\u3067\u8d77\u3053\u308b\u78ba\u7387\u3088\u308a\u3082\u4f4e\u304f\u306a\u308b\u3079\u304d\u3060\u304c\u3001\u9023\u8a00\u932f\u8aa4\u3067\u306f\u9006\u8ee2\u3057\u3001\u8ad6\u7406\u7684\u3067\u306f\u306a\u3044\u5224\u65ad\u3092\u4e0b\u3057\u3066\u3057\u307e\u3046\u3002\u5408\u63a5\u306e\u8aa4\u8b2c\uff08\u3054\u3046\u305b\u3064\u306e\u3054\u3073\u3085\u3046\uff1a<span lang=\"en\">conjunction fallacy<\/span>\uff09\u3068\u3082\u547c\u3076\u3002<\/p>\n<h3 data-start=\"239\" data-end=\"251\">\u63d0\u5531\u8005\u3068\u8d77\u6e90<\/h3>\n<div id=\"attachment_17757\" style=\"width: 329px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-17757\" class=\"wp-image-17757 size-full\" src=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2019\/12\/kahneman-tversky.jpg\" alt=\"\u30c0\u30cb\u30a8\u30eb\u30fb\u30ab\u30fc\u30cd\u30de\u30f3\u3068\u30a8\u30a4\u30e2\u30b9\u30fb\u30c8\u30d9\u30eb\u30b9\u30ad\u30fc\" width=\"319\" height=\"196\" srcset=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2019\/12\/kahneman-tversky.jpg 319w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2019\/12\/kahneman-tversky-300x184.jpg 300w\" sizes=\"auto, (max-width: 319px) 100vw, 319px\" \/><p id=\"caption-attachment-17757\" class=\"wp-caption-text\">\u5de6\uff1a\u30c0\u30cb\u30a8\u30eb\u30fb\u30ab\u30fc\u30cd\u30de\u30f3\u3001\u53f3\uff1a\u30a8\u30a4\u30e2\u30b9\u30fb\u30c8\u30d9\u30eb\u30b9\u30ad\u30fc\uff08\u51fa\u5c55\uff1a<a href=\"http:\/\/grawemeyer.org\">http:\/\/grawemeyer.org<\/a>\uff09<\/p><\/div>\n<p data-start=\"253\" data-end=\"400\">\u30c0\u30cb\u30a8\u30eb\u30fb\u30ab\u30fc\u30cd\u30de\u30f3\uff08Daniel Kahneman\uff09<strong data-start=\"288\" data-end=\"293\">\u3068<\/strong>\u30a8\u30a4\u30e2\u30b9\u30fb\u30c8\u30f4\u30a7\u30eb\u30b9\u30ad\u30fc\uff08Amos Tversky\uff09\u306b\u3088\u3063\u30661970\u5e74\u4ee3\u306b\u63d0\u5531\u3055\u308c\u305f\u3002<\/p>\n<p data-start=\"253\" data-end=\"400\">\u5f7c\u3089\u306f\u300c\u30ea\u30f3\u30c0\u554f\u984c\u300d\u3068\u3044\u3046\u5b9f\u9a13\u306b\u3088\u3063\u3066\u3053\u306e\u932f\u8aa4\u3092\u660e\u3089\u304b\u306b\u3057\u3001<strong data-start=\"368\" data-end=\"383\">\u4eba\u9593\u306e\u975e\u5408\u7406\u306a\u5224\u65ad\u7279\u6027<\/strong>\u3092\u8a8d\u77e5\u30d0\u30a4\u30a2\u30b9\u7814\u7a76\u306e\u4e2d\u6838\u306b\u636e\u3048\u305f\u3002<\/p>\n<h3 data-start=\"506\" data-end=\"524\">\u00a0\u6709\u540d\u306a\u5b9f\u9a13\uff08\u30ea\u30f3\u30c0\u554f\u984c\uff09<\/h3>\n<blockquote data-start=\"526\" data-end=\"649\">\n<p data-start=\"528\" data-end=\"649\">\u30ea\u30f3\u30c0\u306f31\u6b73\u3002\u72ec\u8eab\u3067\u8061\u660e\u3001\u54f2\u5b66\u3092\u5b66\u3093\u3060\u3002\u5b66\u751f\u6642\u4ee3\u306b\u306f\u5dee\u5225\u3084\u793e\u4f1a\u6b63\u7fa9\u306e\u554f\u984c\u306b\u71b1\u5fc3\u3067\u3001\u53cd\u6838\u30c7\u30e2\u306b\u3082\u53c2\u52a0\u3057\u3066\u3044\u305f\u3002<br \/>\n<br data-start=\"583\" data-end=\"586\" \/><strong>Q. \u6b21\u306e\u3069\u3061\u3089\u304c\u3088\u308a\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u304b\uff1f<\/strong><br data-start=\"607\" data-end=\"610\" \/>A\uff09\u30ea\u30f3\u30c0\u306f\u9280\u884c\u54e1\u3067\u3042\u308b<br data-start=\"624\" data-end=\"627\" \/>B\uff09\u30ea\u30f3\u30c0\u306f\u9280\u884c\u54e1\u3067\u3001\u30d5\u30a7\u30df\u30cb\u30b9\u30c8\u3067\u3042\u308b<\/p>\n<\/blockquote>\n<p data-start=\"651\" data-end=\"695\">\u591a\u304f\u306e\u4eba\u304c<strong data-start=\"656\" data-end=\"683\">B\u3068\u7b54\u3048\u308b\u304c\u3001\u78ba\u7387\u8ad6\u7684\u306b\u306fA\u306e\u65b9\u304c\u8d77\u3053\u308a\u3084\u3059\u3044<\/strong>\u3002\u3053\u308c\u304c\u9023\u8a00\u932f\u8aa4\u3067\u3042\u308b\u3002<\/p>\n<h2 data-start=\"702\" data-end=\"719\">\u30c7\u30b6\u30a4\u30f3\u306b\u304a\u3051\u308b\u6d3b\u7528\u6cd5<\/h2>\n<h3 data-start=\"721\" data-end=\"746\">1. \u30e6\u30fc\u30b6\u30fc\u30b7\u30ca\u30ea\u30aa\u306b\u304a\u3051\u308b\u932f\u899a\u306e\u6392\u9664<\/h3>\n<p data-start=\"748\" data-end=\"803\"><strong data-start=\"748\" data-end=\"756\">\u5229\u7528\u65b9\u6cd5<\/strong>\uff1a\u904e\u5270\u306a\u30da\u30eb\u30bd\u30ca\u8a2d\u5b9a\u3084\u30b9\u30c8\u30fc\u30ea\u30fc\u8a2d\u8a08\u306b\u3088\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u632f\u308b\u821e\u3044\u304c\u4e0d\u81ea\u7136\u306b\u8907\u96d1\u306b\u306a\u308b\u3053\u3068\u3092\u9632\u3050\u3002<\/p>\n<p data-start=\"805\" data-end=\"813\"><strong data-start=\"805\" data-end=\"812\">\u5177\u4f53\u4f8b<\/strong>\uff1a<\/p>\n<ul>\n<li data-start=\"816\" data-end=\"894\">\u300c\u3053\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u5973\u6027\u306730\u4ee3\u3001\u74b0\u5883\u554f\u984c\u306b\u8208\u5473\u304c\u3042\u308a\u3001\u30bd\u30fc\u30b7\u30e3\u30eb\u30a2\u30d7\u30ea\u3082\u983b\u7e41\u306b\u4f7f\u3046\u300d\u306a\u3069\u8907\u6570\u7279\u5fb4\u3092\u60f3\u5b9a\u3057\u3066UI\u3092\u4f5c\u308b\u3068\u3001\u591a\u304f\u306e\u30e6\u30fc\u30b6\u30fc\u304b\u3089\u4e56\u96e2\u3059\u308b\u6050\u308c\u304c\u3042\u308b\u3002<\/li>\n<li data-start=\"897\" data-end=\"937\">\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u306a\u524d\u63d0\uff08\u4f8b\uff1a\u300c\u51fa\u5148\u3067\u7d20\u65e9\u304f\u60c5\u5831\u3092\u5f97\u305f\u3044\u300d\uff09\u306b\u7acb\u811a\u3057\u305f\u8a2d\u8a08\u304c\u671b\u307e\u3057\u3044\u3002<\/li>\n<\/ul>\n<h3 data-start=\"944\" data-end=\"968\">2. \u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u8a2d\u8a08\u3067\u306e\u512a\u5148\u5ea6\u5224\u65ad<\/h3>\n<p data-start=\"970\" data-end=\"1032\"><strong data-start=\"970\" data-end=\"978\">\u5229\u7528\u65b9\u6cd5<\/strong>\uff1a\u30e6\u30fc\u30b6\u30fc\u306b\u300cA\u304b\u3064B\u306e\u6a5f\u80fd\u300d\u304c\u6b32\u3057\u3044\u3068\u601d\u308f\u305b\u308b\u6587\u8108\u3067\u3001<strong data-start=\"1006\" data-end=\"1025\">\u5358\u72ec\u6a5f\u80fdA\u306e\u4fa1\u5024\u3092\u4e0b\u3052\u3066\u3057\u307e\u3046<\/strong>\u72b6\u6cc1\u3092\u907f\u3051\u308b\u3002<\/p>\n<p data-start=\"1034\" data-end=\"1042\"><strong data-start=\"1034\" data-end=\"1041\">\u5177\u4f53\u4f8b<\/strong>\uff1a<\/p>\n<ul data-start=\"1043\" data-end=\"1124\">\n<li data-start=\"1043\" data-end=\"1124\">\n<p data-start=\"1045\" data-end=\"1124\">\u300cPDF\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u304c\u3067\u304d\u3066\u3001\u304b\u3064\u5370\u5237\u7528\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u308b\u300dUI\u3092\u60f3\u5b9a\u3057\u3066\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u96c6\u3081\u308b\u3068\u3001\u524d\u63d0\u304c\u8907\u96d1\u306b\u306a\u308a\u3059\u304e\u3066\u771f\u306e\u30cb\u30fc\u30ba\u304c\u898b\u3048\u306a\u304f\u306a\u308b\u3002<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"1131\" data-end=\"1158\">3. \u30b5\u30fc\u30d9\u30a4\u3084\u610f\u601d\u6c7a\u5b9a\u652f\u63f4\u306b\u304a\u3051\u308b\u6587\u8108\u8abf\u6574<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-33546\" src=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2025\/06\/\u9023\u8a00\u932f\u8aa4-1024x1024.png\" alt=\"\" width=\"496\" height=\"496\" srcset=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2025\/06\/\u9023\u8a00\u932f\u8aa4-1024x1024.png 1024w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2025\/06\/\u9023\u8a00\u932f\u8aa4-150x150.png 150w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2025\/06\/\u9023\u8a00\u932f\u8aa4-300x300.png 300w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2025\/06\/\u9023\u8a00\u932f\u8aa4-768x768.png 768w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2025\/06\/\u9023\u8a00\u932f\u8aa4.png 1080w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2025\/06\/\u9023\u8a00\u932f\u8aa4-640x640.png 640w\" sizes=\"auto, (max-width: 496px) 100vw, 496px\" \/><\/p>\n<p data-start=\"1160\" data-end=\"1225\"><strong data-start=\"1160\" data-end=\"1168\">\u5229\u7528\u65b9\u6cd5<\/strong>\uff1a\u30e6\u30fc\u30b6\u30fc\u8abf\u67fb\u3084A\/B\u30c6\u30b9\u30c8\u306e\u8a2d\u554f\u8a2d\u8a08\u3067\u3001\u9023\u8a00\u69cb\u9020\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b\uff08\u30d0\u30a4\u30a2\u30b9\u3092\u8a98\u3063\u3066\u3044\u306a\u3044\u304b\uff09\u3092\u70b9\u691c\u3059\u308b\u3002<\/p>\n<p data-start=\"1227\" data-end=\"1235\"><strong data-start=\"1227\" data-end=\"1234\">\u5177\u4f53\u4f8b<\/strong>\uff1a<\/p>\n<ul>\n<li data-start=\"1238\" data-end=\"1269\">\u2715\u300c\u3053\u306e\u30a2\u30d7\u30ea\u306f\u4f7f\u3044\u3084\u3059\u304f\u3001\u304b\u3064\u5b89\u5fc3\u611f\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3057\u305f\u304b\uff1f\u300d<\/li>\n<li data-start=\"1272\" data-end=\"1323\">\u25ef\u300c\u3053\u306e\u30a2\u30d7\u30ea\u306f\u4f7f\u3044\u3084\u3059\u304b\u3063\u305f\u3067\u3059\u304b\uff1f\u300d\u3068\u300c\u5b89\u5fc3\u611f\u304c\u3042\u308a\u307e\u3057\u305f\u304b\uff1f\u300d\u3092\u5206\u3051\u308b\u65b9\u304c\u30c7\u30fc\u30bf\u7cbe\u5ea6\u306f\u9ad8\u304f\u306a\u308b\u3002<\/li>\n<\/ul>\n<h2 data-start=\"1330\" data-end=\"1349\">\u5b9f\u8df5\u30b7\u30fc\u30f3<\/h2>\n<div class=\"_tableContainer_16hzy_1\">\n<div class=\"_tableWrapper_16hzy_14 group flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1351\" data-end=\"1720\">\n<thead data-start=\"1351\" data-end=\"1423\">\n<tr data-start=\"1351\" data-end=\"1423\">\n<th data-start=\"1351\" data-end=\"1381\" data-col-size=\"sm\">\u30b7\u30fc\u30f3<\/th>\n<th data-start=\"1381\" data-end=\"1423\" data-col-size=\"sm\">\u5229\u7528\u30dd\u30a4\u30f3\u30c8\u3068\u9023\u8a00\u932f\u8aa4\u306e\u56de\u907f<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"1510\" data-end=\"1720\">\n<tr data-start=\"1510\" data-end=\"1562\">\n<td data-start=\"1510\" data-end=\"1531\" data-col-size=\"sm\">\u30da\u30eb\u30bd\u30ca\u30fb\u30b7\u30ca\u30ea\u30aa\u8a2d\u8a08<\/td>\n<td data-start=\"1531\" data-end=\"1562\" data-col-size=\"sm\">\u8907\u6570\u306e\u5c5e\u6027\u3092\u7d44\u307f\u5408\u308f\u305b\u3059\u304e\u305a\u3001\u57fa\u672c\u30cb\u30fc\u30ba\u306b\u96c6\u4e2d<\/td>\n<\/tr>\n<tr data-start=\"1563\" data-end=\"1616\">\n<td data-start=\"1563\" data-end=\"1585\" data-col-size=\"sm\">\u30e6\u30fc\u30b6\u30fc\u30c6\u30b9\u30c8\u3084\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u8a55\u4fa1<\/td>\n<td data-start=\"1585\" data-end=\"1616\" 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