{"id":11152,"date":"2025-07-15T13:34:50","date_gmt":"2025-07-15T13:34:50","guid":{"rendered":"https:\/\/functiontranslator.com\/dist-t-2c\/"},"modified":"2021-02-25T17:31:16","modified_gmt":"2021-02-25T17:31:16","slug":"t-dist-2t","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/pt-pt\/t-dist-2t\/","title":{"rendered":"DIST.T.2C"},"content":{"rendered":"

Introdu\u00e7\u00e3o ao Uso da Fun\u00e7\u00e3o para Distribui\u00e7\u00e3o T Bicaudal<\/h2>\n

A fun\u00e7\u00e3o T.DIST.2T<\/strong> no Excel e a fun\u00e7\u00e3o DIST.T.2C<\/strong> no Google Planilhas s\u00e3o utilizadas para calcular a probabilidade das duas caudas de uma distribui\u00e7\u00e3o t-student. Essa fun\u00e7\u00e3o \u00e9 amplamente empregada em an\u00e1lises estat\u00edsticas, especialmente para testes de hip\u00f3teses que consideram a m\u00e9dia de amostras pequenas.<\/p>\n

Sintaxe e Exemplos<\/h2>\n

No Excel<\/strong>, a sintaxe da fun\u00e7\u00e3o \u00e9:<\/p>\n

 T.DIST.2T(x, graus_de_liberdade) <\/code> <\/pre>\n
Onde:<\/p>\n
    \n
  • x<\/strong> representa o valor t para o qual a probabilidade \u00e9 calculada.<\/li>\n
  • graus_de_liberdade<\/strong> correspondem aos graus de liberdade da distribui\u00e7\u00e3o t.<\/li>\n<\/ul>\n
    Exemplo no Excel:<\/p>\n
     =T.DIST.2T(1.5, 10) <\/code> <\/pre>\n
    Este exemplo calcula a probabilidade de obter um valor t de 1.5 ou maior, ou -1.5 ou menor, com 10 graus de liberdade.<\/p>\n
    No Google Planilhas, a fun\u00e7\u00e3o tem uma sintaxe similar:<\/p>\n
     DIST.T.2C(x, graus_de_liberdade) <\/code> <\/pre>\n
    Exemplo no Google Planilhas:<\/p>\n
     =DIST.T.2C(1.5, 10) <\/code> <\/pre>\n
    A fun\u00e7\u00e3o tamb\u00e9m retorna a mesma probabilidade que no Excel.<\/p>\n
    Aplica\u00e7\u00f5es Pr\u00e1ticas<\/h2>\n
    Essa fun\u00e7\u00e3o \u00e9 particularmente \u00fatil nos seguintes cen\u00e1rios:<\/p>\n
    Teste de Hip\u00f3tese para M\u00e9dias de Amostras Pequenas<\/h2>\n
    Suponha que um pesquisador deseje testar se a m\u00e9dia de um novo tratamento difere significativamente da m\u00e9dia esperada de 100 mmHg. Com uma amostra de 10 medi\u00e7\u00f5es, obt\u00e9m-se uma m\u00e9dia de 105 mmHg e um desvio padr\u00e3o de 15 mmHg. O valor t calculado \u00e9:<\/p>\n
     ((105 - 100) \/ (15 \/ SQRT(10))) = 1.054 <\/code> <\/pre>\n
    Utilizando a fun\u00e7\u00e3o, a probabilidade de obter um resultado t\u00e3o extremo ou mais do que 1.054 \u00e9:<\/p>\n
     =T.DIST.2T(1.054, 9) <\/code> <\/pre>\n
    Coment\u00e1rios<\/strong>: O pesquisador pode, ent\u00e3o, analisar se a diferen\u00e7a observada \u00e9 estatisticamente significativa, baseando-se em um n\u00edvel de signific\u00e2ncia pr\u00e9-definido, como 0.05.<\/p>\n
    Compara\u00e7\u00e3o de Duas M\u00e9dias de Amostras Independentes<\/h2>\n
    Duas turmas, submetidas a m\u00e9todos de ensino distintos, s\u00e3o avaliadas por meio de um teste. A turma A, com 10 alunos, alcan\u00e7ou uma m\u00e9dia de 75 e um desvio padr\u00e3o de 8, enquanto a turma B, tamb\u00e9m com 10 alunos, obteve uma m\u00e9dia de 65 e um desvio padr\u00e3o de 7. O valor t calculado \u00e9:<\/p>\n\n\n\n
    M\u00e9dia A<\/th>\nDesvio Padr\u00e3o A<\/th>\nM\u00e9dia B<\/th>\nDesvio Padr\u00e3o B<\/th>\nValor t<\/th>\n<\/tr>\n
    75<\/td>\n8<\/td>\n65<\/td>\n7<\/td>\nCalcular abaixo<\/td>\n<\/tr>\n<\/table>\n
     Valor t = (75 - 65) \/ SQRT((8^2)\/10 + (7^2)\/10) = 3.975 <\/code> <\/pre>\n
    A probabilidade de que esta diferen\u00e7a ocorra por acaso \u00e9:<\/p>\n
     =T.DIST.2T(3.975, 18) <\/code> <\/pre>\n
    Coment\u00e1rios<\/strong>: Esse resultado permite que os educadores avaliem a efic\u00e1cia dos m\u00e9todos de ensino \u00e0 luz da signific\u00e2ncia estat\u00edstica da diferen\u00e7a observada nos resultados dos testes.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Devolve os Pontos Percentuais (probabilidade) para a 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-11152","post","type-post","status-publish","format-standard","hentry","category-estatistica"],"acf":[],"yoast_head":"\nFun\u00e7\u00e3o T.DIST.2T (DIST.T.2C) no Excel \u2013 como funciona, exemplos e sintaxe<\/title>\n<meta name=\"description\" content=\"Breve descri\u00e7\u00e3o da fun\u00e7\u00e3o T.DIST.2T (DIST.T.2C) do Excel. 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