{"id":1002,"date":"2023-07-28T01:01:14","date_gmt":"2023-07-28T01:01:14","guid":{"rendered":"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/"},"modified":"2023-07-28T01:01:14","modified_gmt":"2023-07-28T01:01:14","slug":"como-encontrar-z-alfa-2-za-2","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/","title":{"rendered":"Como encontrar z alfa\/2 (za\/2)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Sempre que voc\u00ea encontrar o termo <strong>z <sub>\u03b1\/2<\/sub><\/strong> nas estat\u00edsticas, ele simplesmente se refere ao <strong>valor cr\u00edtico de z<\/strong> na tabela z que corresponde a \u03b1\/2.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este tutorial explica o seguinte:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">Como encontrar z <sub>\u03b1\/2<\/sub> usando a tabela az.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Como encontrar z <sub>\u03b1\/2<\/sub> usando uma calculadora.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Os valores mais comuns para z <sub>\u03b1\/2<\/sub> .<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Vamos!<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Como encontrar z <sub>\u03b1\/2<\/sub> usando a tabela az<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Suponha que queiramos encontrar z <sub>\u03b1\/2<\/sub> para um teste usando um n\u00edvel de confian\u00e7a de 90%.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Neste caso, \u03b1 seria 1 \u2013 0,9 = <strong>0,1<\/strong> . Assim, \u03b1\/2 = 0,1\/2 = <strong>0,05<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Para encontrar o valor z cr\u00edtico correspondente, simplesmente procurar\u00edamos <strong>0,05<\/strong> na matriz az:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-10393 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/za2.png\" alt=\"za\/2 na tabela z\" width=\"619\" height=\"611\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Observe que o valor exato de <strong>0,05<\/strong> n\u00e3o aparece na tabela, mas ficaria diretamente entre os valores <strong>0,0505<\/strong> e <strong>0,0495<\/strong> . Os valores cr\u00edticos correspondentes de z fora da tabela s\u00e3o <strong>-1,64<\/strong> e <strong>-1,65<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Dividindo a diferen\u00e7a, vemos que o valor cr\u00edtico de z seria <strong>-1,645<\/strong> . E normalmente, quando usamos z <sub>\u03b1\/2,<\/sub> tomamos o valor absoluto. Assim, z <sub>0,01\/2<\/sub> = <strong>1,645<\/strong> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Como encontrar z <sub>\u03b1\/2<\/sub> usando uma calculadora<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Tamb\u00e9m podemos usar uma<\/span> calculadora de valor cr\u00edtico de Z <span style=\"color: #000000;\">para encontrar z <sub>\u03b1\/2<\/sub> para alguns testes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Por exemplo, para alguns testes que usam um n\u00edvel de confian\u00e7a de 90%, podemos simplesmente inserir <strong>0,1<\/strong> como n\u00edvel de signific\u00e2ncia e a calculadora retornar\u00e1 automaticamente o valor de <strong>1,645<\/strong> como o valor z cr\u00edtico correspondente:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-10394 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/za2_2.png\" alt=\"Calculadora de valor Z cr\u00edtico\" width=\"392\" height=\"310\" srcset=\"\" sizes=\"auto, \"><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Valores comuns para z <sub>\u03b1\/2<\/sub><\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">A tabela a seguir exibe os valores cr\u00edticos mais comuns para diferentes valores de \u03b1:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-10395 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/za2_3.png\" alt=\"Valores comuns de za\/2\" width=\"206\" height=\"191\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">A forma de interpretar esta tabela \u00e9 a seguinte:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">Para um teste que utiliza um n\u00edvel de confian\u00e7a de 90% (por exemplo, \u03b1 = 0,1), o valor cr\u00edtico de z \u00e9 <strong>1,645<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">Para um teste que utiliza um n\u00edvel de confian\u00e7a de 95% (por exemplo, \u03b1 = 0,05), o valor cr\u00edtico de z \u00e9 <strong>1,96<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">Para um teste que utiliza um n\u00edvel de confian\u00e7a de 99% (por exemplo, \u03b1 = 0,01), o valor cr\u00edtico de z \u00e9 <strong>5,576<\/strong> .<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">E assim por diante.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\"><a href=\"https:\/\/statorials.org\/pt\/como-usar-a-tabela-z\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como usar a tabela Z (com exemplos)<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/calculadora-de-valor-critico-z-ti-84\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como encontrar o valor cr\u00edtico de Z em uma calculadora TI-84<\/a><br \/><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sempre que voc\u00ea encontrar o termo z \u03b1\/2 nas estat\u00edsticas, ele simplesmente se refere ao valor cr\u00edtico de z na tabela z que corresponde a \u03b1\/2. Este tutorial explica o seguinte: Como encontrar z \u03b1\/2 usando a tabela az. Como encontrar z \u03b1\/2 usando uma calculadora. Os valores mais comuns para z \u03b1\/2 . Vamos! [&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-1002","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>Como encontrar Z Alpha\/2 (za\/2) \u2013 Estatologia<\/title>\n<meta name=\"description\" content=\"Uma explica\u00e7\u00e3o simples do termo za\/2 em estat\u00edsticas, incluindo exemplos de como encontr\u00e1-lo.\" \/>\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\/como-encontrar-z-alfa-2-za-2\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como encontrar Z Alpha\/2 (za\/2) \u2013 Estatologia\" \/>\n<meta property=\"og:description\" content=\"Uma explica\u00e7\u00e3o simples do termo za\/2 em estat\u00edsticas, incluindo exemplos de como encontr\u00e1-lo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-28T01:01:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/za2.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=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/\",\"url\":\"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/\",\"name\":\"Como encontrar Z Alpha\/2 (za\/2) \u2013 Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-28T01:01:14+00:00\",\"dateModified\":\"2023-07-28T01:01:14+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Uma explica\u00e7\u00e3o simples do termo za\/2 em estat\u00edsticas, incluindo exemplos de como encontr\u00e1-lo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/como-encontrar-z-alfa-2-za-2\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como encontrar z alfa\/2 (za\/2)\"}]},{\"@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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