{"id":10798,"date":"2025-07-15T13:34:51","date_gmt":"2025-07-15T13:34:51","guid":{"rendered":"https:\/\/functiontranslator.com\/int-confianca-t\/"},"modified":"2021-02-25T17:15:43","modified_gmt":"2021-02-25T17:15:43","slug":"confidence-t","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/pt-pt\/confidence-t\/","title":{"rendered":"INT.CONFIAN\u00c7A.T"},"content":{"rendered":"

A fun\u00e7\u00e3o INT.CONFIAN\u00c7A.T no Microsoft Excel e CONFIDENCE.T no Google Planilhas \u00e9 usada para calcular o intervalo de confian\u00e7a da m\u00e9dia de uma popula\u00e7\u00e3o. Esta fun\u00e7\u00e3o \u00e9 baseada na distribui\u00e7\u00e3o T de Student, sendo particularmente \u00fatil em an\u00e1lises estat\u00edsticas que envolvem amostras pequenas e quando a vari\u00e2ncia da popula\u00e7\u00e3o \u00e9 desconhecida.<\/p>\n

Sintaxe e Usos B\u00e1sicos<\/h2>\n

A sintaxe desta fun\u00e7\u00e3o \u00e9:<\/p>\n

CONFIDENCE.T(alpha, desvio_pad, tamanho_amostra)<\/code><\/pre>\n
    \n
  • alpha<\/code> – O n\u00edvel de signific\u00e2ncia, que \u00e9 igual a 1 menos o n\u00edvel de confian\u00e7a. Por exemplo, para um n\u00edvel de confian\u00e7a de 95%, o valor de alpha seria 0,05.<\/li>\n
  • desvio_pad<\/code> – O desvio padr\u00e3o da amostra.<\/li>\n
  • tamanho_amostra<\/code> – O n\u00famero total de observa\u00e7\u00f5es na amostra, que deve ser superior a 1.<\/li>\n<\/ul>\n
    Exemplo B\u00e1sico:<\/p>\n
    =CONFIDENCE.T(0.05, 10, 30)<\/code><\/pre>\n
    Este exemplo, assumindo um n\u00edvel de confian\u00e7a de 95%, um desvio padr\u00e3o da amostra de 10 e um tamanho de amostra de 30, calcular\u00e1 o intervalo de confian\u00e7a para a m\u00e9dia da popula\u00e7\u00e3o.<\/p>\n
    Aplica\u00e7\u00f5es Pr\u00e1ticas<\/h2>\n
    A fun\u00e7\u00e3o CONFIDENCE.T \u00e9 extremamente \u00fatil em v\u00e1rias situa\u00e7\u00f5es pr\u00e1ticas:<\/p>\n
    Estimativa do Intervalo de Confian\u00e7a da M\u00e9dia em Pesquisas Pequenas<\/h2>\n
    Considere um pesquisador que deseja estimar o tempo m\u00e9dio de resposta de um novo website com base no feedback de uma amostra de 25 usu\u00e1rios, com um desvio padr\u00e3o de 2 segundos. Como calcular o intervalo de confian\u00e7a para o tempo m\u00e9dio de resposta com um n\u00edvel de confian\u00e7a de 95%?<\/p>\n
    =CONFIDENCE.T(0.05, 2, 25)<\/code><\/pre>\n
    Esta f\u00f3rmula proporcionar\u00e1 ao pesquisador o intervalo dentro do qual \u00e9 poss\u00edvel esperar que o verdadeiro tempo m\u00e9dio de resposta esteja com 95% de confian\u00e7a.<\/p>\n
    An\u00e1lise de Confiabilidade do Produto<\/h2>\n
    Imagine uma empresa de eletr\u00f4nicos que pretende lan\u00e7ar um novo smartphone e realiza ensaios de bateria em 15 unidades para determinar o tempo m\u00e9dio de dura\u00e7\u00e3o da bateria, resultando em um desvio padr\u00e3o de 1,5 horas. Como determinar o intervalo de confian\u00e7a para a dura\u00e7\u00e3o m\u00e9dia da bateria com 99% de confian\u00e7a?<\/p>\n
    =CONFIDENCE.T(0.01, 1.5, 15)<\/code><\/pre>\n
    O resultado desta opera\u00e7\u00e3o ajudar\u00e1 a empresa a entender a m\u00e9dia real esperada da dura\u00e7\u00e3o da bateria com 99% de confian\u00e7a, baseada na m\u00e9dia obtida da amostra testada.<\/p>\n
    Esses exemplos ilustram como a fun\u00e7\u00e3o INT.CONFIAN\u00c7A.T (CONFIDENCE.T) pode ser uma ferramenta essencial para a tomada de decis\u00f5es informadas em contextos onde se lida com amostras pequenas e a vari\u00e2ncia da popula\u00e7\u00e3o \u00e9 desconhecida.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Devolve o intervalo de confian\u00e7a para uma m\u00e9dia da popula\u00e7\u00e3o, utilizando uma distribui\u00e7\u00e3o t de Student<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[442],"tags":[],"class_list":["post-10798","post","type-post","status-publish","format-standard","hentry","category-estatistica"],"acf":[],"yoast_head":"\nFun\u00e7\u00e3o CONFIDENCE.T (INT.CONFIAN\u00c7A.T) no Excel \u2013 como funciona, exemplos e sintaxe<\/title>\n<meta name=\"description\" content=\"Breve descri\u00e7\u00e3o da fun\u00e7\u00e3o CONFIDENCE.T (INT.CONFIAN\u00c7A.T) do Excel. 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