{"id":74,"date":"2023-08-05T18:14:48","date_gmt":"2023-08-05T18:14:48","guid":{"rendered":"https:\/\/statorials.org\/pt\/diferenca-media\/"},"modified":"2023-08-05T18:14:48","modified_gmt":"2023-08-05T18:14:48","slug":"diferenca-media","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/diferenca-media\/","title":{"rendered":"Diferen\u00e7a m\u00e9dia"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 o desvio m\u00e9dio e como ele \u00e9 calculado. Voc\u00ea tamb\u00e9m encontrar\u00e1 exemplos concretos de c\u00e1lculo do desvio m\u00e9dio. E, al\u00e9m disso, voc\u00ea poder\u00e1 calcular o desvio m\u00e9dio de qualquer conjunto de dados estat\u00edsticos usando uma calculadora online.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%c2%bfque-es-la-desviacion-media\"><\/span> O que \u00e9 desvio m\u00e9dio?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>O desvio m\u00e9dio<\/strong> , tamb\u00e9m chamado <strong>de desvio m\u00e9dio absoluto<\/strong> , \u00e9 uma medida de dispers\u00e3o estat\u00edstica.<\/p>\n<p> <strong>O desvio m\u00e9dio de um conjunto de dados \u00e9 a m\u00e9dia dos desvios absolutos<\/strong> . Portanto, o desvio m\u00e9dio \u00e9 igual \u00e0 soma dos desvios de cada item de dados da m\u00e9dia aritm\u00e9tica dividida pelo n\u00famero total de itens de dados.<\/p>\n<p> Em outras palavras, a <strong>f\u00f3rmula do desvio m\u00e9dio<\/strong> \u00e9 a seguinte: <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/ecart-moyen.png\" alt=\"diferen\u00e7a m\u00e9dia\" class=\"wp-image-1541\" width=\"297\" height=\"276\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<p> \ud83d\udc49 <u style=\"text-decoration-color:#FF8A05;\">Voc\u00ea pode usar a calculadora abaixo para calcular o desvio m\u00e9dio de qualquer conjunto de dados.<\/u><\/p>\n<p> Nas estat\u00edsticas, o desvio m\u00e9dio tamb\u00e9m \u00e9 chamado <strong>de desvio m\u00e9dio absoluto<\/strong> .<\/p>\n<p> A interpreta\u00e7\u00e3o do desvio m\u00e9dio \u00e9 feita da seguinte forma: quanto maior o valor do desvio m\u00e9dio, significa que os dados est\u00e3o, em m\u00e9dia, mais afastados da m\u00e9dia aritm\u00e9tica; inversamente, quanto menor o desvio m\u00e9dio, mais pr\u00f3ximo o valor. os dados s\u00e3o. O desvio m\u00e9dio indica, portanto, a dispers\u00e3o de uma s\u00e9rie de dados.<\/p>\n<p> Outras medidas consideradas distribu\u00eddas s\u00e3o amplitude, intervalo interquartil, desvio padr\u00e3o (ou desvio padr\u00e3o), vari\u00e2ncia e coeficiente de varia\u00e7\u00e3o. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"como-calcular-la-desviacion-media\"><\/span> Como calcular o desvio m\u00e9dio<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Para calcular o desvio m\u00e9dio de uma s\u00e9rie de dados, devem ser seguidos os seguintes passos:<\/p>\n<ol style=\"color:#FF8A05; font-weight: bold;\">\n<li style=\"margin-bottom:12px\"> <span style=\"color:#101010;font-weight: normal;\"><a href=\"https:\/\/statorials.org\/pt\/media-aritmetica\/\">Calcule a m\u00e9dia aritm\u00e9tica<\/a> do conjunto de dados estat\u00edsticos.<\/span><\/li>\n<li style=\"margin-bottom:12px\"> <span style=\"color:#101010;font-weight: normal;\">Calcule o desvio de cada ponto de dados da m\u00e9dia, definido como o valor absoluto da diferen\u00e7a entre os dados e a m\u00e9dia.<\/span><\/li>\n<li style=\"margin-bottom:12px\"> <span style=\"color:#101010;font-weight: normal;\">Some todas as diferen\u00e7as calculadas na etapa anterior.<\/span><\/li>\n<li> <span style=\"color:#101010;font-weight: normal;\">Divida pelo n\u00famero total de dados. O resultado obtido \u00e9 o desvio m\u00e9dio da s\u00e9rie de dados.<\/span><\/li>\n<\/ol>\n<p> Em resumo, a f\u00f3rmula que deve ser aplicada para encontrar o desvio m\u00e9dio \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-a5342bcc6a35ed68ea8b5cb5da036ff1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{\\sum_{i=1}^N|x_i-\\overline{x}|}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"154\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ejemplo-del-calculo-de-la-desviacion-media\"><\/span> Exemplo de c\u00e1lculo do desvio m\u00e9dio<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Considerando a defini\u00e7\u00e3o de desvio m\u00e9dio, segue abaixo um exemplo resolvido passo a passo de c\u00e1lculo do desvio m\u00e9dio de uma amostra estat\u00edstica. Assim voc\u00ea entender\u00e1 melhor como obter o desvio m\u00e9dio.<\/p>\n<ul>\n<li> Um analista estuda os resultados econ\u00f4micos de uma empresa no ano passado e tem informa\u00e7\u00f5es sobre o lucro obtido pela empresa em cada trimestre desse ano: 2, 3, 7 e 5 milh\u00f5es de d\u00f3lares. Qual \u00e9 o desvio m\u00e9dio dos dados?<\/li>\n<\/ul>\n<p> Primeiro, precisamos calcular a m\u00e9dia dos dados, ent\u00e3o somamos e dividimos pelo n\u00famero total de observa\u00e7\u00f5es (4):<\/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-3e8cecec9bc27208f96a31bd687f697d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\overline{x}=\\cfrac{2+3+7+5}{4}=4,25\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"194\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Depois de calcular a m\u00e9dia aritm\u00e9tica, usamos a f\u00f3rmula do desvio m\u00e9dio:<\/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-a5342bcc6a35ed68ea8b5cb5da036ff1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{\\sum_{i=1}^N|x_i-\\overline{x}|}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"154\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Substitu\u00edmos os dados na f\u00f3rmula:<\/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-435722eb1d69186ca2a1c231c927e6b3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{|2-4,25|+|3-4,25|+|7-4,25|+|5-4,25|}{4}\" title=\"Rendered by QuickLaTeX.com\" height=\"40\" width=\"414\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Fazemos os c\u00e1lculos no numerador: <\/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-c7b4aef2fb04b0b04ac6432063bb376d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{|-2,25|+|-1,25|+|2,75|+|0,75|}{4}\" title=\"Rendered by QuickLaTeX.com\" height=\"40\" width=\"335\" 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-d7507572edcc98e3c6917b82d00ed4e6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{2,25+1,25+2,75+0,75}{4}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"252\" 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-be315cfc86d44477cd522d31d99816c6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{7}{4}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"58\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> E por fim, dividimos pelo n\u00famero total de dados para obter o desvio m\u00e9dio da amostra: <\/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-f06b78532a33d778a587f87d1c31d38e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=1,75\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"81\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"calculadora-de-la-desviacion-media\"><\/span> Calculadora de desvio m\u00e9dio<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Insira um conjunto de dados estat\u00edsticos na calculadora a seguir para calcular seu desvio m\u00e9dio. Os dados devem ser separados por espa\u00e7o e inseridos usando o ponto final como separador decimal. <\/p>\n<form action=\"\" method=\"post\"><textarea name=\"datos\" style=\"border:1.5px solid #4FC3F7; border-radius:15px;\" placeholder=\"2 3 7 5 6.2 9 ...\" required=\"\" oninvalid=\"this.setCustomValidity('Introduce los datos aqu\u00ed')\" oninput=\"this.setCustomValidity('')\"><\/textarea><\/p>\n<div style=\"text-align:center\"><input align=\"center\" style=\"border-radius:30px; margin: 20px\" type=\"submit\" name=\"submit\" value=\"Calcule o desvio m\u00e9dio\"><\/div>\n<\/form>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"desviacion-media-para-datos-agrupados\"><\/span> Desvio m\u00e9dio para dados agrupados<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Para calcular o desvio m\u00e9dio dos dados agrupados em intervalos, devem ser seguidos os seguintes passos:<\/p>\n<ol style=\"color:#FF8A05; font-weight: bold;\">\n<li style=\"margin-bottom:12px\"> <span style=\"color:#101010;font-weight: normal;\">Determine a m\u00e9dia aritm\u00e9tica do conjunto de dados estat\u00edsticos. Como os dados est\u00e3o agrupados, a express\u00e3o para calcular a m\u00e9dia \u00e9:<\/span><\/li>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-ead6b86a37d3fc21832ddee98cda7759_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\overline{x}=\\cfrac{\\sum_{i=1}^N x_i\\cdot f_i}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"127\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<li style=\"margin-bottom:12px\"> <span style=\"color:#101010;font-weight: normal;\">Calcule o desvio de cada intervalo da m\u00e9dia, que equivale ao valor absoluto da diferen\u00e7a entre a nota da turma e a m\u00e9dia.<\/span><\/li>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-1a84d44d3ab0beb30dae7d260a1428ac_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"|x_i-\\overline{x}|\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"53\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<li style=\"margin-bottom:12px\"> <span style=\"color:#101010;font-weight: normal;\">Multiplique o desvio de cada intervalo pela sua frequ\u00eancia absoluta.<\/span><\/li>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-2fce850a1d982284a1dc04904e0169e5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"|x_i-\\overline{x}|\\cdot f_i\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"82\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<li style=\"margin-bottom:12px\"> <span style=\"color:#101010;font-weight: normal;\">Some todos os resultados da etapa anterior e divida pelo n\u00famero total de dados. O resultado obtido \u00e9 o desvio m\u00e9dio da amostra agrupada em intervalos.<\/span><\/li>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/ql-cache\/quicklatex.com-504a50df6e04ed512d61e300f89970cb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\cfrac{\\sum_{i=1}^N|x_i-\\overline{x}|\\cdot f_i}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"132\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<\/ol>\n<p> Concluindo, a <strong>f\u00f3rmula para obter o desvio m\u00e9dio dos dados agrupados<\/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-ea1e3e9cd3ff7fee38fc8287d50d22e4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{\\sum_{i=1}^N|x_i-\\overline{x}|\\cdot f_i}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"181\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Quando os dados s\u00e3o agrupados, geralmente significa que h\u00e1 muitos dados e encontrar o desvio m\u00e9dio envolve muitas etapas. Portanto, geralmente s\u00e3o utilizadas tabelas de frequ\u00eancia para realizar o c\u00e1lculo.<\/p>\n<p> Abaixo est\u00e1 um exerc\u00edcio passo a passo sobre como calcular o desvio m\u00e9dio quando os dados s\u00e3o agrupados em intervalos: <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/exemple-intervalles-de-donnees.png\" alt=\"\" class=\"wp-image-1553\" width=\"258\" height=\"190\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<p> A primeira coisa a fazer \u00e9 calcular a m\u00e9dia dos dados agrupados. Para fazer isso, adicionamos uma coluna \u00e0 tabela multiplicando a nota da turma pela sua frequ\u00eancia: <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/exemple-intervalles-de-donnees-2.png\" alt=\"\" class=\"wp-image-1554\" width=\"343\" height=\"190\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<p> A m\u00e9dia aritm\u00e9tica ser\u00e1, portanto, o resultado da divis\u00e3o da soma da coluna somada pela soma das frequ\u00eancias absolutas:<\/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-47ff7f0bd851fdca827e9614e30c346a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\overline{x}=\\cfrac{\\sum_{i=1}^N x_i\\cdot f_i}{N}=\\cfrac{7040}{150}=46,93\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"254\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Agora que sabemos a m\u00e9dia dos dados, podemos adicionar todas as colunas necess\u00e1rias para encontrar o desvio m\u00e9dio: <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/exemples-dintervalles-de-donnees-32.png\" alt=\"\" class=\"wp-image-1566\" width=\"559\" height=\"190\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<p> Assim, para obter o desvio m\u00e9dio deve-se dividir a soma da \u00faltima coluna pelo n\u00famero total de observa\u00e7\u00f5es:<\/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-878c77391b5267367871fbd1aa79b807_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_{\\overline{x}}=\\cfrac{\\sum_{i=1}^N|x_i-\\overline{x}|\\cdot f_i}{N}=\\cfrac{1728,67}{150}=11,52\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"334\" style=\"vertical-align: -12px;\"><\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 o desvio m\u00e9dio e como ele \u00e9 calculado. Voc\u00ea tamb\u00e9m encontrar\u00e1 exemplos concretos de c\u00e1lculo do desvio m\u00e9dio. E, al\u00e9m disso, voc\u00ea poder\u00e1 calcular o desvio m\u00e9dio de qualquer conjunto de dados estat\u00edsticos usando uma calculadora online. O que \u00e9 desvio m\u00e9dio? O desvio m\u00e9dio , tamb\u00e9m chamado de [&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-74","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 Desvio m\u00e9dio: o que \u00e9, f\u00f3rmula, exemplos e calculadora<\/title>\n<meta name=\"description\" content=\"Explicamos o que \u00e9 o desvio m\u00e9dio e como ele \u00e9 calculado (f\u00f3rmula). 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