{"id":256,"date":"2023-08-03T12:41:07","date_gmt":"2023-08-03T12:41:07","guid":{"rendered":"https:\/\/statorials.org\/pt\/pontuacao-z\/"},"modified":"2023-08-03T12:41:07","modified_gmt":"2023-08-03T12:41:07","slug":"pontuacao-z","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/pontuacao-z\/","title":{"rendered":"Pontua\u00e7\u00e3o z"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 pontua\u00e7\u00e3o Z nas estat\u00edsticas. Voc\u00ea tamb\u00e9m aprender\u00e1 como calcular o Z-score de uma a\u00e7\u00e3o, exemplos de como ele \u00e9 calculado e quais s\u00e3o as caracter\u00edsticas dos Z-scores. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%c2%bfque-es-la-puntuacion-z\"><\/span> O que \u00e9 pontua\u00e7\u00e3o Z?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> O <strong>escore Z<\/strong> , ou <strong>escore Z<\/strong> , \u00e9 uma pontua\u00e7\u00e3o estat\u00edstica que indica quantos desvios padr\u00e3o um valor tem da m\u00e9dia. Para calcular uma pontua\u00e7\u00e3o Z para um valor, subtraia a m\u00e9dia desse valor e depois divida pelo desvio padr\u00e3o da amostra de dados.<\/p>\n<p> Por exemplo, se um valor for dois desvios padr\u00e3o menor que a m\u00e9dia aritm\u00e9tica do conjunto de dados, a pontua\u00e7\u00e3o Z desse valor ser\u00e1 -2.<\/p>\n<p> Este termo estat\u00edstico tamb\u00e9m \u00e9 chamado de <strong>pontua\u00e7\u00e3o padr\u00e3o<\/strong> , <strong>estat\u00edstica Z<\/strong> ou <strong>valor Z.<\/strong><\/p>\n<p> O escore Z de um valor \u00e9 muito \u00fatil em testes de hip\u00f3teses para calcular os limites dos intervalos de confian\u00e7a e portanto a regi\u00e3o de rejei\u00e7\u00e3o da hip\u00f3tese nula. <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 20px; padding-left: 30px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/intervalo-de-confianca\/\">O que \u00e9 um intervalo de confian\u00e7a nas estat\u00edsticas?<\/a> <\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"formula-de-la-puntuacion-z\"><\/span> F\u00f3rmula de pontua\u00e7\u00e3o Z<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>O escore Z \u00e9 igual \u00e0 diferen\u00e7a entre o valor e a m\u00e9dia do conjunto de dados dividida pelo desvio padr\u00e3o.<\/strong> Portanto, para encontrar o escore Z, primeiro deve-se subtrair a m\u00e9dia do valor e depois dividir o resultado pelo desvio padr\u00e3o.<\/p>\n<p> Resumindo, a <strong>f\u00f3rmula do escore Z<\/strong> \u00e9:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-d95c28d27f77d977ff6c9b7fcb1b8480_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z=\\cfrac{X-\\overline{X}}{\\sigma}\" title=\"Rendered by QuickLaTeX.com\" height=\"41\" width=\"93\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Ouro<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-0be116875001706f29a24434bd0d91c9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a pontua\u00e7\u00e3o Z,<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-a84020904813123dc75b89c701025ecd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"X_i\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"20\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 o valor a partir do qual a pontua\u00e7\u00e3o Z \u00e9 calculada,<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-5b485d4231dfeb4b50ddf271c3abb0b3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\overline{X}\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"17\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a m\u00e9dia aritm\u00e9tica e<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-eaaf379fee5e67946f3fedf5631047b1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\sigma\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 o desvio padr\u00e3o ou desvio t\u00edpico.<\/p>\n<p> A interpreta\u00e7\u00e3o do valor do escore Z \u00e9 simples: o valor do escore Z indica o n\u00famero de desvios padr\u00e3o entre um valor e a m\u00e9dia. Portanto, quanto maior o valor absoluto do escore Z, mais o valor se desviar\u00e1 da m\u00e9dia. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ejemplos-de-puntuaciones-z\"><\/span> Exemplos de pontua\u00e7\u00f5es Z<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Depois de vermos a defini\u00e7\u00e3o de escore Z, para que voc\u00ea possa entender melhor seu significado, nesta se\u00e7\u00e3o procedemos \u00e0 resolu\u00e7\u00e3o de um exemplo em que v\u00e1rios escores Z s\u00e3o calculados.<\/p>\n<ul>\n<li> Calcule as pontua\u00e7\u00f5es Z para todos os seguintes dados: 7, 2, 4, 9, 3<\/li>\n<\/ul>\n<p> Primeiro, precisamos encontrar a m\u00e9dia aritm\u00e9tica dos dados amostrais: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-58669a07e461a9747b39102cc4775733_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\overline{X}=\\cfrac{7+2+4+9+3}{5}=5\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"204\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 20px; padding-left: 30px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/media-aritmetica\/\">Como \u00e9 calculada a m\u00e9dia aritm\u00e9tica?<\/a><\/div>\n<p class=\"has-text-align-left\"> Em segundo lugar, calculamos o desvio padr\u00e3o da s\u00e9rie de dados: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-bdd7b3d503cf74ee9d40e048c42f4310_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\sigma=2,61\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"68\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 20px; padding-left: 30px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/desvio-padrao-ou-desvio-padrao\/\">Calculadora de desvio padr\u00e3o<\/a><\/div>\n<p> E, finalmente, aplicamos a f\u00f3rmula do escore Z para cada dado e calculamos todos os escores Z: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-d95c28d27f77d977ff6c9b7fcb1b8480_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z=\\cfrac{X-\\overline{X}}{\\sigma}\" title=\"Rendered by QuickLaTeX.com\" height=\"41\" width=\"93\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-9cc8368486f111e58b19371371764247_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z_1=\\cfrac{7-5}{2,61}=0,77\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"142\" style=\"vertical-align: -16px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-1a83d919634eb30117f8486f2aeb353e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z_2=\\cfrac{7-2}{2,61}=1,92\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"141\" style=\"vertical-align: -16px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-2b97295bd9d968df0fc0f94f5591cd52_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z_3=\\cfrac{7-4}{2,61}=1,15\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"141\" style=\"vertical-align: -16px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-bc52b9731711b52ca7053a4dff1f5859_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z_4=\\cfrac{7-9}{2,61}=-0,77\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"156\" style=\"vertical-align: -16px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-95a1a2a8d573a0da47be3dbb719dc9f7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"Z_5=\\cfrac{7-3}{2,61}=1,53\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"142\" style=\"vertical-align: -16px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"la-puntuacion-z-y-la-regla-empirica\"><\/span> A pontua\u00e7\u00e3o Z e a regra pr\u00e1tica<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <span style=\"text-decoration: underline;\">No caso em que a distribui\u00e7\u00e3o da amostra \u00e9 uma distribui\u00e7\u00e3o normal<\/span> , gra\u00e7as \u00e0 regra emp\u00edrica, podemos saber rapidamente a que percentagem de valores corresponde a um valor calculando o seu escore Z. <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 20px; padding-left: 30px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/distribuicao-normal\/\">O que \u00e9 uma distribui\u00e7\u00e3o normal?<\/a><\/div>\n<p> Portanto, a regra pr\u00e1tica afirma que em qualquer distribui\u00e7\u00e3o normal, o seguinte \u00e9 verdadeiro:<\/p>\n<ul>\n<li> 68% dos valores est\u00e3o dentro de um desvio padr\u00e3o da m\u00e9dia.<\/li>\n<li> 95% dos valores est\u00e3o dentro de dois desvios padr\u00e3o da m\u00e9dia.<\/li>\n<li> 99,7% dos valores est\u00e3o dentro de tr\u00eas desvios padr\u00e3o da m\u00e9dia.<\/li>\n<\/ul>\n<p> Portanto, se esta for uma distribui\u00e7\u00e3o normal, podemos deduzir o seguinte da regra pr\u00e1tica:<\/p>\n<ul>\n<li> Se a pontua\u00e7\u00e3o Z for menor que 1, o valor est\u00e1 entre os 68% melhores dos valores.<\/li>\n<li> Se a pontua\u00e7\u00e3o Z for maior que 1, mas menor que 2, o valor est\u00e1 entre os 95% principais dos valores.<\/li>\n<li> Se o escore Z for maior que 2, mas menor que 3, o valor est\u00e1 entre 99,7% dos valores.<\/li>\n<\/ul>\n<p> Voc\u00ea pode ver mais valores da regra pr\u00e1tica na tabela a seguir: <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 20px; padding-left: 30px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Consulte:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/regra-pratica\/\">Tabela de valores de regras pr\u00e1ticas<\/a> <\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"propiedades-de-las-puntuaciones-z\"><\/span> Propriedades de pontua\u00e7\u00e3o Z<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As pontua\u00e7\u00f5es Z t\u00eam as seguintes propriedades:<\/p>\n<ul>\n<li> A m\u00e9dia aritm\u00e9tica de todas as pontua\u00e7\u00f5es Z \u00e9 sempre 0.<\/li>\n<li> O desvio padr\u00e3o das pontua\u00e7\u00f5es Z \u00e9 1.<\/li>\n<li> As pontua\u00e7\u00f5es Z s\u00e3o adimensionais, pois as unidades do numerador se cancelam com as unidades do denominador.<\/li>\n<li> Se o escore Z for positivo, significa que o valor \u00e9 maior que a m\u00e9dia amostral. Por outro lado, se o escore Z for negativo, significa que o valor \u00e9 inferior \u00e0 m\u00e9dia amostral.<\/li>\n<li> As pontua\u00e7\u00f5es Z s\u00e3o muito \u00fateis para comparar diferentes distribui\u00e7\u00f5es.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 pontua\u00e7\u00e3o Z nas estat\u00edsticas. Voc\u00ea tamb\u00e9m aprender\u00e1 como calcular o Z-score de uma a\u00e7\u00e3o, exemplos de como ele \u00e9 calculado e quais s\u00e3o as caracter\u00edsticas dos Z-scores. O que \u00e9 pontua\u00e7\u00e3o Z? O escore Z , ou escore Z , \u00e9 uma pontua\u00e7\u00e3o estat\u00edstica que indica quantos desvios padr\u00e3o [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-256","post","type-post","status-publish","format-standard","hentry","category-estatisticas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u25b7 Pontua\u00e7\u00e3o Z (estat\u00edsticas)<\/title>\n<meta name=\"description\" content=\"Aqui voc\u00ea encontrar\u00e1 o que \u00e9 o escore Z nas estat\u00edsticas, como ele \u00e9 calculado (f\u00f3rmula), exemplos de seu c\u00e1lculo e as caracter\u00edsticas dos escores Z.\" \/>\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\/pt\/pontuacao-z\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u25b7 Pontua\u00e7\u00e3o Z (estat\u00edsticas)\" \/>\n<meta property=\"og:description\" content=\"Aqui voc\u00ea encontrar\u00e1 o que \u00e9 o escore Z nas estat\u00edsticas, como ele \u00e9 calculado (f\u00f3rmula), exemplos de seu c\u00e1lculo e as caracter\u00edsticas dos escores Z.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/pontuacao-z\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-08-03T12:41:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-d95c28d27f77d977ff6c9b7fcb1b8480_l3.png\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/pontuacao-z\/\",\"url\":\"https:\/\/statorials.org\/pt\/pontuacao-z\/\",\"name\":\"\u25b7 Pontua\u00e7\u00e3o Z (estat\u00edsticas)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-08-03T12:41:07+00:00\",\"dateModified\":\"2023-08-03T12:41:07+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Aqui voc\u00ea encontrar\u00e1 o que \u00e9 o escore Z nas estat\u00edsticas, como ele \u00e9 calculado (f\u00f3rmula), exemplos de seu c\u00e1lculo e as caracter\u00edsticas dos escores Z.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/pontuacao-z\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/pontuacao-z\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/pontuacao-z\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Pontua\u00e7\u00e3o z\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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