{"id":726,"date":"2023-07-28T23:17:14","date_gmt":"2023-07-28T23:17:14","guid":{"rendered":"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/"},"modified":"2023-07-28T23:17:14","modified_gmt":"2023-07-28T23:17:14","slug":"calculadora-de-intervalo-de-confianca-diferenca-entre-medias","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/","title":{"rendered":"Calculadora de intervalo de confian\u00e7a para diferen\u00e7a entre m\u00e9dias"},"content":{"rendered":"<p><script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/mathjs\/5.1.1\/math.js\"><\/script><script src=\"https:\/\/cdn.jsdelivr.net\/npm\/jstat@latest\/dist\/jstat.min.js\"><\/script><\/p>\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css?family=Droid+Serif|Raleway');<\/p>\n<p>.axis--y .domain {\n  display: none;\n}<\/p>\n<p>h1 {\ntext-align: center;\nfont-size: 50px;\nmargin-bottom: 0px;\nfont-family: 'Raleway', serif;\n}<\/p>\n<p>p {\ncolor: black;\nmargin-bottom: 15px;\nmargin-top: 15px;\nfont-family: 'Raleway', sans-serif;\n}<\/p>\n<p>#words {\ncolor: black;\nfont-family: Raleway;\nmax-width: 550px;\nmargin: 25px auto;\nline-height: 1.75;\npadding-left: 100px;\n}<\/p>\n<p>#words_calc {\ncolor: black;\nfont-family: Raleway;\nmax-width: 550px;\nmargin: 25px auto;\nline-height: 1.75;\npadding-left: 100px;\n}<\/p>\n<p>#hr_top {\nwidth: 30%;\nmargin-bottom: 0px;\nborder: none;\nheight: 2px;\ncolor: black;\nbackground-color: black;\n}<\/p>\n<p>#hr_bottom {\nwidth: 30%;\nmargin-top: 15px;\nborder: none;\nheight: 2px;\ncolor: black;\nbackground-color: black;\n}<\/p>\n<p>#words label, #words input, #words_calc input {\n    display: inline-block;\n    vertical-align: baseline;\n    width: 350px;\n    max-height: 35px;\n}<\/p>\n<p>    #buttonCalc {\n      border: 1px solid;\n      border-radius: 10px;\n      margin-top: 20px;\n      padding: 10px 10px;\n      cursor: pointer;\n      outline: none;\n      background-color: white;\n      color: black;\n      font-family: 'Work Sans', sans-serif;\n      border: 1px solid grey;\n      \/* Green *\/\n    }<\/p>\n<p>    #buttonCalc:hover {\n      background-color: #f6f6f6;\n      border: 1px solid black;\n    }<\/p>\n<p>#words_intro {\ncolor: black;\nfont-family: Raleway;\nmax-width: 550px;\nmargin: 25px auto;\nline-height: 1.75;\n}\n<\/style>\n<div id=\"words_intro\">Um <b>intervalo de confian\u00e7a para uma diferen\u00e7a entre m\u00e9dias<\/b> \u00e9 um intervalo de valores que pode conter a verdadeira diferen\u00e7a entre duas m\u00e9dias populacionais com um certo n\u00edvel de confian\u00e7a.<\/div>\n<div id=\"words_intro\"> A f\u00f3rmula para calcular o intervalo de confian\u00e7a \u00e9:<\/div>\n<div id=\"words_intro\"> Intervalo de confian\u00e7a = ( <span style=\"text-decoration:overline\">x<\/span> <sub>1<\/sub> \u2013 <span style=\"text-decoration:overline\">x<\/span> <sub>2<\/sub> ) +\/- t*\u221a((s <sub>p<\/sub> <sup>2<\/sup> \/n <sub>1<\/sub> ) + (s <sub>p<\/sub> <sup>2<\/sup> \/n <sub>2<\/sub> ))<\/div>\n<div id=\"words_intro\"> Ouro:<\/div>\n<div id=\"words_intro\">\n<ul>\n<li> <span style=\"text-decoration:overline\">x<\/span> <sub>1<\/sub> , <span style=\"text-decoration:overline\">x<\/span> <sub>2<\/sub> : m\u00e9dia da amostra 1, m\u00e9dia da amostra 2<\/li>\n<li> t: o valor t-cr\u00edtico com base no n\u00edvel de confian\u00e7a<\/li>\n<li> s <sub>p<\/sub> <sup>2<\/sup> : vari\u00e2ncia agrupada<\/li>\n<li> n <sub>1<\/sub> , n <sub>2<\/sub> : tamanho da amostra 1, tamanho da amostra 2<\/li>\n<\/ul>\n<\/div>\n<div id=\"words_intro\"> Para encontrar um intervalo de confian\u00e7a para a diferen\u00e7a entre duas m\u00e9dias, basta preencher as caixas abaixo e clicar no bot\u00e3o \u201cCalcular\u201d.<\/div>\n<div id=\"words\"> <label><b><span style=\"text-decoration:overline\">x<\/span> <sub>1<\/sub><\/b> (m\u00e9dia da amostra 1)<\/label><input type=\"number\" id=\"x1\" value=\"15.1\"><\/div>\n<div id=\"words\"> <label><b>s <sub>1<\/sub><\/b> (desvio padr\u00e3o da amostra 1)<\/label><input type=\"number\" id=\"s1\" value=\"4.3\"><\/div>\n<div id=\"words\"> <label><b>n <sub>1<\/sub><\/b> (tamanho da amostra 1)<\/label><input type=\"number\" id=\"n1\" value=\"22\"><\/div>\n<div id=\"words\"> <label><b><span style=\"text-decoration:overline\">x<\/span> <sub>2<\/sub><\/b> (m\u00e9dia da amostra 2)<\/label><input type=\"number\" id=\"x2\" value=\"14.3\"><\/div>\n<div id=\"words\"> <label><b>s <sub>2<\/sub><\/b> (desvio padr\u00e3o da amostra 2)<\/label><input type=\"number\" id=\"s2\" value=\"4.9\"><\/div>\n<div id=\"words\"> <label><b>n <sub>2<\/sub><\/b> (tamanho da amostra 2)<\/label><input type=\"number\" id=\"n2\" value=\"22\"><\/div>\n<div id=\"words\"> <label><b>Um n\u00edvel de confian\u00e7a<\/b><\/label> <input type=\"number\" id=\"conf\" value=\"0.95\" step=\"0.01\" min=\"0\" max=\"1\"><\/div>\n<div id=\"words_calc\"><input type=\"button\" id=\"buttonCalc\" onclick=\"calc()\" value=\"Calculate\"><\/div>\n<div>\n<p style=\"text-align:center\"> IC <span id=\"confOut\">95<\/span> % = [ <span id=\"low\">-2,0049<\/span> , <span id=\"high\">3,6049<\/span> ]<\/p>\n<\/div>\n<div id=\"words_intro\"> Voc\u00ea pode ter <span id=\"confOut2\">95<\/span> % de certeza de que o intervalo [ <span id=\"low2\">-2,0049<\/span> , <span id=\"high2\">3,6049<\/span> ] cont\u00e9m a verdadeira diferen\u00e7a entre as m\u00e9dias populacionais <sub>\u03bc1<\/sub> e <sub>\u03bc2<\/sub> .<\/div>\n<p><script><\/p>\n<p>function calc() {<\/p>\n<p>\/\/get input values\nvar x1 = +document.getElementById('x1').value;\nvar s1 = +document.getElementById('s1').value;\nvar n1 = +document.getElementById('n1').value;\nvar x2 = +document.getElementById('x2').value;\nvar s2 = +document.getElementById('s2').value;\nvar n2 = +document.getElementById('n2').value;\nvar conf = +document.getElementById('conf').value;<\/p>\n<p>var confUse = conf - (-(1-conf)\/2);\nvar confOut = conf*100;\nvar df = n1 - (-1*n2) - 2;\nvar s2p = ((n1-1)*(Math.pow(s1,2)) - ((-1*(n2-1))*Math.pow(s2,2))) \/ df;<\/p>\n<p>\/\/calculate stuff\nvar meanDiff = x1-x2;\nvar t = jStat.studentt.inv(confUse, df);\nvar se = Math.sqrt((s2p\/n1) - (-1*s2p\/n2));<\/p>\n<p>var low = meanDiff - (t*se);\nvar high = meanDiff - (-1*t*se);\nconsole.log(s2p);<\/p>\n<p>\/\/output results\ndocument.getElementById('confOut').innerHTML = confOut;\ndocument.getElementById('confOut2').innerHTML = confOut;\ndocument.getElementById('low').innerHTML = low.toFixed(4);\ndocument.getElementById('low2').innerHTML = low.toFixed(4);\ndocument.getElementById('high').innerHTML = high.toFixed(4);\ndocument.getElementById('high2').innerHTML = high.toFixed(4);\n}<\/p>\n<p><\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Um intervalo de confian\u00e7a para uma diferen\u00e7a entre m\u00e9dias \u00e9 um intervalo de valores que pode conter a verdadeira diferen\u00e7a entre duas m\u00e9dias populacionais com um certo n\u00edvel de confian\u00e7a. A f\u00f3rmula para calcular o intervalo de confian\u00e7a \u00e9: Intervalo de confian\u00e7a = ( x 1 \u2013 x 2 ) +\/- t*\u221a((s p 2 \/n [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-726","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Calculadora de intervalo de confian\u00e7a para diferen\u00e7a entre m\u00e9dias<\/title>\n<meta name=\"description\" content=\"Esta calculadora encontra o intervalo de confian\u00e7a para a diferen\u00e7a entre duas m\u00e9dias, com base na entrada do usu\u00e1rio.\" \/>\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\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Calculadora de intervalo de confian\u00e7a para diferen\u00e7a entre m\u00e9dias\" \/>\n<meta property=\"og:description\" content=\"Esta calculadora encontra o intervalo de confian\u00e7a para a diferen\u00e7a entre duas m\u00e9dias, com base na entrada do usu\u00e1rio.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-28T23:17:14+00:00\" \/>\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=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/\",\"url\":\"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/\",\"name\":\"Calculadora de intervalo de confian\u00e7a para diferen\u00e7a entre m\u00e9dias\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-28T23:17:14+00:00\",\"dateModified\":\"2023-07-28T23:17:14+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Esta calculadora encontra o intervalo de confian\u00e7a para a diferen\u00e7a entre duas m\u00e9dias, com base na entrada do usu\u00e1rio.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/calculadora-de-intervalo-de-confianca-diferenca-entre-medias\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculadora de intervalo de confian\u00e7a para diferen\u00e7a entre m\u00e9dias\"}]},{\"@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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